Equipment: High speed steel 4341, Made of high speed steel (HSS), high hardness and rust resistance for long life. Size: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5. 6 set sizes, which meet your different needs perfectly. A sharp, induction hardened drill bit, resistant to slightly induced wear, to ensure the puncture speed, improve work efficiency. The full drilling , tapping, deburring and milling in one operation save processing steps and time costs, improve working efficiency. 6 steel bits, suitable for drilling wood , plastic, fine copper, aluminum and other soft metals (5-6mm), not for hard materials (eg sheet steel). When you drill a hole, you need to inject water at the same time to cool the drill bit. This will help you increase the value of the exercises. 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. Specification: Color: Golden Type: Percussion bit Chamfer angle: 90 DIY Supplies: Metallurgy Shank: 1/4 "(6.35mm) hexagonal shank Material: High speed steel 4341 Size: M3, M4, M5, M6, M8, M10 The Note: Please add oil before operating the valve, so that the operation is smoother, and also to extend the life of the valve. faucet. Application: High speed steel 4241 is suitable for wood, aluminum, and other lower hardness material, material thickness is 3-5mm. Be careful when using it with hard metal! Package Included: 6 pcs Hex Shank Tap Drill Bits