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)