Features: These faucets are made of high quality steel bearing for high hardness. There are a total of 7 pieces of faucets in different sizes from M3 to M12, which can be used to thread different threads. They are used to cut new threads or repair damaged threads, you will have a smooth threading experience with them. These faucets are used with a tap wrench for threading, the wrench is not included. Great tools used to create threads for wood, plastic, aluminum or many other soft materials. Specifications:Material: Bearing SteelStandard: MetricSize: M3, M4, M5, M6, M8, M10, M12Quantity: 7Instruction:1, Insert the taper part first, and make sure the center line of the faucet agrees with the center line of drilling.2, turn the faucet wrench with even force to feed the faucet, no need to add force after feeding.3, reverse the rotation about 45 each time turn the faucet, to cut the chip to avoid blocking.4, if it is difficult to turn the faucet, stop adding force, or the touch will be damaged. Package Included: 7 x Faucets (Faucet Key Not Included)