Used for cutting internal and external threads. Made of tough carbon tool steel, hardened and tempered for smooth accurate threading. Set contains 17 taps, 17 one-inch hex dies, tap and reamer wrench, die stock, two T-handle wrenches, screw pitch gage, and adjusting screwdriver. NC-style sizes: 4-40, 6-32, 8-32, 10-24, 12-24, 1/4-20, 5-16-18, 3/8-16, 7/16-14, 1/2-13. NF-style sizes: 10-32, 1/4-28, 5/16-24, 3/8-24, 7/16-20, 1/2-20. NPT-style sizes: 1/8-27. Packaged in a molded plastic case.

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