【Material】 Made of high speed steel (HSS), high hardness and rust resistance for long life. 【6 Sizes Set】 M3 (0.5mm), M4 (0.7mm), M5 (0.8mm), M6 (1.0mm), M8 (1.25mm), M10 (1.5mm). 6 steel bits, which perfectly meet your different needs.A sharp, hardened drill bit induction, resistant to slightly induced wear, to ensure puncture speed, improve work efficiency. 【High Efficiency】 Full drilling, tapping, deburring and milling in one operation save processing steps and time costs, improve working efficiency. 【Application】 Suitable for drilling wood, plastic, fine copper, aluminum and other soft metals (5-6mm), not for hard materials (eg sheet steel ). 【Precautions】 When drilling a hole, you need to inject water at the same time to cool the drill bit. If you cannot cool the drill bit when drilling holes, the drilling speed should not be too high, and you should not drill too frequently.