Repairs and renews damaged threads on most wheel studs for most cars and light trucks. Rethreading dies are heat treated and tempered for strength and thoroughness and are hex shaped for use with a socket or wrench. Rethreading dies remove burrs and nicks and are for chasing work. Rethreader file is heat treated to maintain proper hardness to ensure wear resistance. The rethreading file is used before the dies on damaged threads.