Male end threads into existing M18 x 1.5 O2 Bungs, bolt-on installation with no cutting or modification of stock wiring required. Designed for off-road race/track use to prevent CEL (Check Engine Light)/MIL (Malfunction Indicator Lamp) from illuminating when removing the stock catalytic converter. Fits all M18x1.5 threaded oxygen sensors and vehicles/exhaust systems with M18 x 1.5 oxygen sensor holes. Features durable corrosion resistant plating and precision-cut threads for a proper seal, preventing exhaust leaks and maintaining proper sensor readings. Easy straight bolt-on installation, no modifications needed. Material: Iron; Size: 22*32mm; Color: As shown. Package includes 4 oxygen sensor bungs. Note: Light and different displays may cause the color of the item in the picture to differ slightly from the real thing. Measurement allowed error is +/- 1-3cm.