Thread Restoring File, 12-28 TPI

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Restores damaged or rusted external threads on bolts, threaded shafts, pipes and pipe fittings.Use to restore damaged or rusted threads of bolts, threaded shafts, pipes, and pipe f ittings. The crosscut design has a depth that is proportional to the thread pitch.Suitable for pitches 12, 13, 14, 16, 18, 20, 24 & 28 threads per inch. Show more