ZVH1251 Features: * Thread repair file * These indispensable files restore damaged external threads on studs, bolts, screws, plumbing pipe and pipe fittings * Four different high carbon steel files are available, each file provides 4 to 8 different thread pitches (for 9, 10, 12, 16, 20, 27, 28, and 32) * Restores rusted or corroded fasteners * Doubles as a screw pitch gage * Black oxide to prevent rust