Features: Increases the distance between the O2-sensor and exhaust system, make sure the actual oxygen sensor is still good. General model is suitable for most automobiles. The surface-treatment has no burrs and is bright overall. Built in micro-catalytic converter, avoid checking engine lights after modifing exhaustor or removing catalytic converter. Easy to disassemble and install. It is not easy to rust, has high hardness and is not easy to deform. Advantages: sealed, wide clamping range, dustproof and waterproof, easy to install, easy to start. Specifications: Material:Aluminium Alloy Type:35mm/45 Degrees/90 Degrees/Brass/55mm Color:Silver Package Includes: 1x O2 Sensor Spacer Adapter note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.