1High hardness, rustproof, solid and durable.2The advantage is opening, tapping, chamfering.3Self-centering point, do not need assistant center drilling or center punching.4Drilling and tapping in one, one-step processing, greatly save processing steps and time costs, improve working efficiency.Material:High hardness, rustproof, solid and durable; Self-centering design:do not need additional center drilling or center punchingFast replacement composite cone, uses drill edged principle. Drilling and tapping in one, one-step processing, greatly save processing steps and time costs, improve working efficiency.Metric:M3x05, M4x07, M5x08, M6x1, M8x125, M10x15Shank:1/4 inch (635mm) hex The Automatic Center Punch delivering an automatic spring-driven strike when pressed against surface, it can be adjusted cap regulates striking forceWidely Use:Suitable for drilling, tapping, cutting on soft metal, aluminum plate, iron, etc. Note:Low Speed and Cutting holes in materials (Thickness:Less than3mm)Size:M3, , M5, M6, M8, M10Center punch material:iron, high-speed steel punch head, brass protective coating Center punch size:13 cm/ 5 inch in length, 127 cm/ 05 inch in diameter Usage:Suitable for drilling, tapping, cutting on soft metal, aluminum plate, iron, etc.colour:GoldenMaterial:High speed steelPackage Contents:6*Screw Tap Bit1*Center Punch Caution:When you use this drill bits, the material temperature will get very high, please add some water or coolant to avoid the material get smoke when using it.Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.