GN177-1 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 11, 12, 13, 14, 16, 18, 20, 24). -Restores rusted or corroded fasteners. Dimensions: Overall Product Weight: -0.01 Pounds.