[High-speed steel and titanium plating]: These taps are made of high-speed steel, precision ground tap sets, the surface is nitrided, with high hardness and rust resistance to meet the high requirements of safety of processes and tools. service life. [Three in [One function]: It can help you complete tasks such as drilling, tapping and chamfering on one drill bit, which greatly saves the processing steps and time costs, and improve work efficiency. [Spiral Taper Design]: The self-tapping screw has a helical flute design. The helical taper design can prevent thread damage from over-drilling, and the chip zone method is better. Self-centering tip, no center drilling or extra centering required. [Package includes]: 6 titanium drill bits (M3, M4, M5, M6, M8, M10) for tapping different threads. Note: Each time you drill a hole, water should be injected at the same time to cool the drill. If the drill cannot be cooled when drilling, the drilling speed should not be too fast or too high. [Extensive applications]: It can be used for drilling, tapping, deburring and countersinking on wood, plastic, thin aluminium, copper and other soft metals (5-6 mm), not suitable for hard materials.