Feature:* .* , and practical.* and long service life.* High hardness, high temperature wear.* Handle made of steel bearing.* Suitable for repairing bicycles, assembling furniture, making machinery, etc.* Suitable for wood, iron, aluminum, thin stainless steel and other materials. Instructions:(1) when tapping, insert the nose cone first to make the center line of the tap align with the center line of the drill hole. (2) Turn the two hands evenly and apply a little pressure to make the faucet enter the cutter. Once the knife is in, there is no need to add pressure. (3) Each time the faucet is rotated, it is turned about 45° to cut off the chips to avoid blockage. (4) do not increase the rotation force if the faucet is difficult to rotate, otherwise the faucet will break. Specification:Material: 6542 high speed steelType: M3, M4, M5, M6, M8Package included:5 pcs. Spiral Manual Faucet(1*M3, 1*M4, 1*M5, 1*M6, 1*M8)Please note:-Due to the differences between different monitors, the picture may not reflect the actual color of the item. Thanks!-Manual measurement, please allow 1-3cm error. Thank you for your understanding.