High Wear Resistance: These taps are made from high quality bearing steel for long term use of high hardness, durability and quality assurance. 7 Different Sizes: There are a total of 7 taps of different sizes, from M3 to M12, which you can use to tap various threads. Function: They are used to cut new threads or repair damaged threads, you will have a smooth tapping experience with them. Great Tools: These taps are used with a tap wrench to do the tapping (wrench is not included) Great tools used to create threads on wood, plastic, aluminum or many other soft materials. Specifications: Material: bearing steel Standard: metric Size: M3, M4, M5, M6, M8, M10, M12 Quantity: 7 Instruction: 1, Insert the cone part first and make sure that the center line of the faucet matches the center line of the drill. 2, Turn the tap wrench with even force to feed the faucet, you don't need to add force after feeding. 3, reverse rotation about 45 each time, turn the tap to cut the chip to avoid blocking. 4, If it is difficult to turn the faucet on, stop adding force or the faucet will be broken.