Material: High Speed Steel 4341,Made of high speed steel (HSS), high hardness and rust resistance for longer 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, drill bit induction hardened, wear-resistant slightly induced, to ensure the puncture speed, improve work efficiency. Complete drilling, tapping, deburring and countersinking in one operation, save processing steps and time costs, improve work efficiency. 6 steel drill bits, suitable for drilling wood, plastic, thin copper, aluminum and other soft metals (5-6 mm), not for hard materials (e.g. steel sheet). 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 drills. 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: Impact Drill Bit Chamfer Angle: 90 DIY Supplies: Metalworking Shank: 1/4"(6.35mm) Hex Shank Material: 4341 High Speed Steel Size: M3, M4, M5, M6, M8, M10 Note: Please add oil before operating the tap, so that the operation is smoother, and also to extend the life of the tap. Application: 4241 high speed steel is suitable for wood, aluminum, and other lower hardness materials, the material thickness is 3-5mm. Be careful if you use it with hard metal! Package Included: 6 pcs Hex Shank Tap Drill Bits becomeveryrich