With simple structure design, O2 sensor spacer is easy for you to install by straight bolt-on without modification. This product features M18x1.5mm threads, allowing you to screw your oxygen sensor into the spacer and then the spacer into your exhaust. Made of highly polished metal, it is corrosion-resistant and durable. The length of the product is 3.2cm. It fits all standard oxygen sensors (most modern vehicles are fitted with M18x1.5mm threaded oxygen sensors). And it is a must need for any off-road vehicle running a high flow cat, sport exhaust, down pipe or a straight pipe. Item Name: O2 Sensor Spacers Material: Metal Thread: M18 X 1.5 Features: Universal, Threaded, Easy Installation Size Details: Length: 3.2cm/1.26" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 2 x O2 Sensor Spacers