1/4 inch HSS Spiral Hex Combination Drill Screw Tap Bit Set (M3-M10) With Automatic Spring Loaded Center Punch

1.High hardness rustproof solid and durable. 2.The advantage is opening tapping chamfering. 3.Self-centering point do not need assistant center drilling or center punching. 4.Drilling 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 punching Fast 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:M3x0.5 M4x0.7 M5x0.8 M6x1 M8x1.25 M10x1.5.:1/4 inch (6.35mm) hex The Automatic Center Punch delivering an automatic spring-driven strike when pressed against surface it can be adjusted cap regulates striking force Widely 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 M4 M5 M6 M8 M10 Center punch material:iron high-speed steel punch head brass protective coating Center punch size:13 cm/ 5 inch in length 1.27 cm/ 0.5 inch in diameter Usage:Suitable for drilling tapping cutting on soft metal aluminum plate iron etc. colour:Golden Material:High speed steel Package Contents: 6*Screw Tap Bit 1*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.