Material: Stainless steel Size: 45mm / 1755.00" M18X1.5 Color: As shown in the picture 1. Enhance exhaust emission performance: The Oxygen O2 Sensor Extender/O2 Oxygen Sensor Spacer 45mm M18X1.5 can extend the length of the oxygen sensor, making it easier to receive more accurate exhaust data and achieve better exhaust emission performance. 2. Enhance engine performance: By extending the length of the oxygen sensor, the Oxygen O2 Sensor Extender/O2 Oxygen Sensor Spacer 45mm M18X1.5 can help the engine get more oxygen, thereby enhancing engine performance. 3. Reduce noise and vibration: Installing the oxygen sensor with the Oxygen O2 Sensor Extender/O2 Oxygen Sensor Spacer 45mm M18X1.5 can reduce engine noise and vibration, making driving smoother and more comfortable. 4. Save fuel costs: The Oxygen O2 Sensor Extender/O2 Oxygen Sensor Spacer 45mm M18X1.5 can help the engine operate more efficiently, thereby saving fuel costs and reducing vehicle operating costs. 5. Easy installation, widely applicable: The Oxygen O2 Sensor Extender/O2 Oxygen Sensor Spacer 45mm M18X1.5 is easy to install and widely applicable, suitable for most car models and engines. Package includes: The quantity you purchased.