Material: High hardness, rustproof, solid and durable Metric: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5.:1/4 inch (6.35mm) hex . HSS Drill Bits Metric Thread Spiral Screw M3 M5 M6 M8 M10 HSS Drill Bit Tap 1/4inch Countersink Hex Bits Set Power Tools Drill tap bits increase efficiency of operation by allowing the complete hole drilling, tapping & deburring / milling in one operation with a drill-saves work, time. 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. Widely Use: Suitable for drilling, tapping, cutting on soft metal, aluminum plate, iron, etc. Note:Low Speed and Cutting holes in materials Colour: gold Material: high-speed steel Package Contents: 11 * Spiral Tap Drill Bit Set 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.