Thread Restoring Files. Restores damaged threads on bolts and shafts. Files are cross-cut and depth proportional to the thread pitch, so will not skip or jump out of fine pitches. All are 7/16 square x 8-3/8 long. Metric. Pitch Sizes: 0.80, 1.00, 1.25, 1.50, 1.75, 2.00, 2.50, 3.00mm. Protect Your Product With a Consumer Priority Service Warranty