This comprehensive tap, die, and drill bit set includes the most popular NC, NF, and NPT tap and die sizes and the appropriate sized drill bit to ensure accurate threading when using a tap. Taps are used to make internal threads to accept a screw of bolt. Dies are used to make external threads to accept a nut. Made from quality tool steel with a titanium nitride coating, these taps, dies, and drill bits have a smooth friction reducing surface for ease of operation. Set includes the necessary tap wrench and die holder to ensure accurate threading.