This ICON™ Professional Tap and Die set is engineered from ultra-tough tungsten molybdenum steel to retain precise cutting edges after use. The set includes UNC, UNF, and NPT taps and dies to cut threads on the most used automotive fasteners. The hardened taps and dies are excellent for cutting new threads or salvaging damaged threads in steel, aluminum, and brass. Like all ICON™ hand tools, this tap and die set is backed by a hassle-free, manufacturer’s lifetime warranty.