Create new threads and clean up damaged threads. Achieve close tolerances for safe, secure fastening. A range of sizes are available from machine screw 6-32 to 1/2-13. HSS hand taps are plug chamfered with 3-5 threads for easy starting. Champion high speed steel hand taps are professional grade threading tools. The iPac solution matches each tap with the correct twist drill. No more time wastes searching for the right size twist drill. With the iPac they are perfectly matched every time.