Nu-thread restoring, rethreading file. Restore damaged threads that are bent, rusted or cross thread. For use on screws, bolts, studs, pipe and pipe fittings. Can be used as a pitch gauge. Oxide coated to prevent corrosion. Product Features:Restore damaged threads that are bent rusted or cross threadedFor use on screws bolts studs pipe and pipe fittings Restoring size 11 12 13 14 16 18 20 and 24 TPICan be used as a pitch gaugeMade in the USA