Cleans theads in oxygen sensor holes. ․Use with 21mm hex socket or 3/8" square drive. ․M18 x 1.5 also works on M18 x 1.5 spark plug threads.
WARNING: California prop 65 - This product contains chemicals known to the state of California to cause cancer, birth defects or other reproductive harm. For more information go to https://www.p65warnings.ca.gov/