Material: 4341 High Speed Steel,Made of High Speed Steel (HSS), high hardness and rust resistance for long service life. Size: M3x0.5, M4x0.7 , M5x0.8, M6x1, M8x1.25, M10x1.5. 6 sizes set, which perfectly meet your different needs. A sharp, the drill bit induction hardened, resistant to slightly induced wear, to ensure the puncture speed, improve work efficiency. Complete drilling, tapping, deburring and countersinking in one operation, save processing steps and time costs, improve working efficiency. 6 drill bits steel, suitable for drilling wood, plastic, fine copper, aluminum and other soft metals (5-6 mm), not for hard materials (eg sheet steel). When drilling 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. Product Description Features: drilling, tapping and deburring / countersinking. Suitable for metal, aluminum tapping Advantage is opening, tapping, chamfering . Multi-purpose impact bit crushing bit crush bit. You can save processing steps and time costs, improve efficiency Tapered back past tap to prevent thread damage from over-drilling. The Its spiral groove, inside the transformation wire, cut out to exclude, And was threaded applied inside the threaded through holes Specification: Color: Gold Type: Hammer Bit Bevel Angle: 90 DIY Supplies: Metalworking Shank: 1/4" (6.35mm) Hex Shank Material: 4341 High Speed Steel Surface Treatment: Titanium Coated 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 faucet. Application: 4241 high speed steel is suitable for wood, aluminum, aluminum and other materials lower in hardness, material thickness is 3-5mm.Be careful if you use it with hard metal!The Package Included: 6 pcs Hex Shank Tap Drill Bits