3-Piece thread restorer file set

Pitches include: SAE Rethread Files (Threads per inch): 9, 10,11, 12, 13, 14, 16, 18, 20, 24, 27, 28 and 32; Metric Rethread File (Millimeters per thread): 0.75, 1.00, 1.25, 1.50, 1.75, 2.00, 2.50, 3.00. Thread restorer files are used to help restore external threads. Just select the right threads per inch or millimeters by using regular file strokes.