[THREAD PITCHES] Four different high carbon steel files are available; each file provides 4 to 8 different thread pitches;
[RUST RESISTANCE] Black oxide to prevent rust.
[APPLICATION]: These indispensable files restore damaged external threads on studs, bolts, screws, plumbing pipe and pipe fittings. Restores rusted or corroded fasteners; doubles as a screw pitch gage.
[PACKAGE]: Slide blister.