For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

Mounting type

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

Mounting type

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

Mounting type

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

Mounting type

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

Mounting type

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

Mounting type

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

Mounting type

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

Mounting type

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

Mounting type

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

Mounting type

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Weight

For oe no.

grdgdrgdr

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Material

For oe no.

grdgdrgdr

Length (mm)

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)

For oe no.

grdgdrgdr

Length (mm)

Fitting position

When purchasing car parts, understanding the importance of the fitting position is crucial for ensuring the correct functionality and safety of your vehicle. Here's why:

1. • Compatibility: Different parts of a vehicle have specific designs and functions tailored to their fitting positions. Installing a part in the wrong position can lead to compatibility issues, causing malfunctions or even damage to other components.
2. • Performance: Each part is engineered to operate optimally within its designated fitting position. Placing a part in the wrong position may compromise its performance, leading to inefficient operation, reduced lifespan, or even failure.
3. • Safety: Certain car parts play critical roles in ensuring the safety of the vehicle and its occupants. Installing safety-related components in the wrong position can significantly compromise vehicle safety, increasing the risk of accidents or injury.
4. • Warranty and Liability: Installing parts in incorrect positions can void warranties and hold the installer liable for any resulting damages or accidents. Manufacturers typically specify fitting positions to ensure proper functionality and to protect against liabilities.
5. • Regulatory Compliance: In some regions, vehicle modifications or improper installations may violate regulations or emissions standards. Ensuring parts are installed in their correct positions helps maintain compliance with regulatory requirements.

In summary, paying attention to the fitting position when purchasing car parts is essential for ensuring compatibility, performance, safety, warranty compliance, and regulatory adherence. Always refer to manufacturer specifications and seek professional assistance if unsure about proper installation procedures.

Inner diameter (mm)