This pipe tap and die set is made of precision ground heat treated and hardened steel for durability. The set includes taps and dies for standard pipe sizes. The wooden storage case keeps the pipe taps and dies organized and corrosion-free. Cuts and renews external and internal threads for standard pipe sizes Heat treated and hardened High carbon steel construction Wooden storage case Precision ground Sizes: 1/4 in.-18 NPT, 3/8 in.-18 NPT, And 1/2 in.-14 NPTBrand New