JPM 40 Piece Tap and Die Set The JPM 40 Piece Tap and Die Set put together some of your commonly used tools into an easy to carry blow mold case so you can chuck it in the back of the car and help your friends fix their cars at their house. Tap & Die Sets are tools that are used to create screw threads, which is called threading. Many are cutting tools and others are forming tools. A tap is used to cut or form the female portion of the mating par ⿿ eg a nut. A die is used to cut or form the male portion of the mating pair ⿿ eg, a bolt. Manufactured from carbon steel for its strength and durability, you know this set will last and last. JPM Tools is a privately owned Australian importer and distributor of professional hardware products.