1Function: This oxygen sensor rethread chaser tool is designed to re tap oxygen sensor threads, straighten damaged threads and prevent future cross threads. 2Advantage: The oxygen sensor thread repair tool makes re tapping the oxygen sensor installation a breeze, eliminating cross threaded holes and keeping your vehicle running smoothly. 3Application: M12x1.25 can be used with 3/8in hex socket. M18x1.5 can be used with 3/4in hex socket or 3/8in square screwdriver, also works with M18x1.5 spark plug threads. 4 Material: Made of premium metal material, oxygen sensor rethread chaser tool has high hardness, wearproof and durable in use. 5Long Service Life: Exquisite and careful workmanship, O2 sensor thread repair tool can be used for a long time, saving your cost, do not need to change frequently.