Wisdom 41pc Tap & Die Set (SAE). This set is made from a professional quality tungsten steel in a handy storage case. Set includes: 17 pieces of taps and 17 matching dies (dies are solid). An adjustable die tool with a built in stock guide. A "t" handle tap wrench for 1/8" - 1/4". A "t" handle tap wrench for 1/4" - 1/2". A #4 adjustable tap wrench for 1/4" - 1/2". A screw pitch gauge. A screw driver. Sizes: 4nc40, 6nc32, 8nc32, 10nc24, 12nc24, 1/4nc20, 5/16nc18, 3/8nc16, 7/16nc14, 1/2nc13, 10nf32, 1/4nf28, 5/16nf24, 3/8nf24, 7/16nf20, 1/2nf20, 1/8npt. Nc=national coarse, nf=national fine, npt=national pipe thread.