Solution to an age-old (and profanity inducing) problem, the ThreadMate™ thread repair tool straightens ANY nicked, bent or damaged metric or standard threads from 5/32"-1/2" (4-14mm). The carbide cutter is anchored to a thread guide that automatically adjusts to any threading. Left-hand thread? Just swap the cutter and guide in the jig and go. A must-have for auto work, jobsite – heck we even used it on a gun barrel!