Features: These taps are made from high quality bearing steel for high hardness. There are total 12 pieces of taps in 6 different sizes from M3 to M12 that you can use for tapping various threads. They are used to cut new threads or repair damaged threads, you will have a smooth tapping experience with them. These taps are used with a tap wrench to do the tapping, wrench is not included. Great tools used to create screw threads on wood, plastic, aluminum or many other soft materials. Specifications: Material: Bearing steel Standard: Metric Size: M3, M4, M6, M8, M10, M12 Quantity: 2pcs each size(total 12pcs) Instruction: 1, Insert cone part first and make sure the tap center line agrees with drilling center line. 2, Rotate tap wrench with a even force to feed tap, don't need to add force after feed. 3, Reverse rotate about 45 each time rotate tap to cut chip in order to avoid blocking. 4, If it is difficult to rotate tap, stop adding force or tap will be broken. Package Includes: 12 x Taps (Tap wrench is not included)