Steel rethreading dies help clean up cross-threaded or otherwise damaged threads, especially those commonly found on the muzzles of AR-15 style rifles. Two-piece split design lets you start the die from the top down or from the bottom up, giving maximum flexibilty for thread repair. Hex shape makes it possible to use with adjustable wrench. Available in 1/2-28 or 5/8-24 threads. Mfg: Jme Innovations SPECS: A2 tool steel, 1" (2.5cm) O.D. 1/2-28 or 5/8-24 threads. .