7PC Rethread Dies Set

7 piece rethreading right hand, fractional, coarse thread hexagonal re-threading dies set. Set consists of 1/4", 5/16",3/8", 7/16", 1/2", and 9/16" rethreading dies. For repairing damaged bolts or studs. Will not crosscut or undercut the thread the way a cutting die will. Do not use on hardened threads for to cut new threads. Made from high carbon alloy steel for a long tool life.