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The OEMTOOLS Oxygen Sensor Thread Chaser is ideal for use with 3/4" hex sockets or 3/8" square drive. Includes sizes M18 x 1.5. It also works with M18 x 1.5 spark plug threads. Not only does this thread chaser clean sensor holes, but it also eliminates cross threaded holes and straightens damaged threadsWarning: This product can expose you to chemicals which are known to the State of California to cause cancer or reproductive defects. For more information, go to www.P65Warnings.ca.gov^