1、M18*1.5 thread pitch, 45mm length Oxygen Sensor Extender Spacer Bungs Adapter 2、These are needed when using a HHO System or a test pipe. They are also used to lean out your vehicle for better gas milage 3、Increases the distance between the O2 sensor and exhaust system 4、Universal fitment for most vehicles with the M18*1.5 O2 sensor hole 5、Threads made with dedicated tool, perfect accuracy and repeatability Features: M18*1.5 thread pitch, 45mm length Oxygen Sensor Extender Spacer Bungs Adapter. These are needed when using a HHO System or a test pipe. They are also used to lean out your vehicle for better gas milage. Increases the distance between the O2 sensor and exhaust system. Universal fitment for most vehicles with the M18*1.5 O2 sensor hole. Threads made with dedicated tool, perfect accuracy and repeatability. Easy installation, direct bolt-on, no modification needed. Made of high quality iron, high strength and durability. Specifications: Material: Iron Color: Yellow Thread Size: M18*1.5 Length: 45mm/1.8in Hex: 22mm/0.9in Item Quantity: 2Pcs Package Weight: approx.102g/3.6oz Fitment: Universal Application: for oxygen sensor extension Package List: 2 * Oxygen Sensor Adapter