2PCS SPARK PLUG CHASER SET M12x1.25 M18x1.5 
2pcs Oxygen Sensor Thread Repair Tool M12x1.25 M18x1.5 Rethread Chaser Kit for Spark Plug
This oxygen sensor rethread chaser tool is designed to re tap oxygen sensor threads, straighten damaged threads and prevent future cross threads.
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.
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.
Thread Size: M12x1.25, M18x1.5