<b>6PCS 1/4" Hex HSS Composite Spiral Screw Tap Drill Thread M3-M10 with Automatic Center Punch Tool</b><br> <br> <b>Specification:</b><br> Material: High-speed steel(HSS 4341)<br> Color: Silver<br> Metric: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5<br> Shank: 1/4" (6.35mm) hex shank<br> Size: M3, M4, M5, M6, M8, M10<br> Center punch material: iron, high-speed steel punch head, brass protective coating <br> Center punch size: 13 cm/ 5 inch in length, 1.27 cm/ 0.5 inch in diameter <br> Usage: Suitable for drilling, tapping, cutting on soft metal, aluminum plate, iron, etc.<br> <br> <b>Description :</b><br> 1.High hardness, rustproof, solid and durable.<br> 2.The advantage is opening, tapping, chamfering.<br> 3.Self-centering point, do not need assistant center drilling or center punching.<br> 4.Drilling and tapping in one, one-step processing, greatly save processing steps and time costs, improve working efficiency.<br> <br> <b>Features :</b><br> 1. Save processing steps and time costs, improve efficiency<br> 2. Spiral groove, within the processing thread, cutting up to exclude, and was curled applied internally threaded through holes<br> <br> <b>Package include:</b><br> 6 x Compound Tap Drill Bits<br> 1 x Automatic Center Punch Tool<br> <br> <b>Caution:</b> 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.<br> <b>【Customer Service】</b>Contact us if you are not satisfied with it for any reason. And we promise all the issue will be solved within 24 hours.