6PCS 1/4" Hex HSS Composite Spiral Screw Tap Drill Thread M3-M10 with Automatic Center Punch Tool Specification: Material: High-speed steel(HSS 4341) Color: Silver Metric: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5 Shank: 1/4" (6.35mm) hex shank 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. Description : 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. Features : 1. Save processing steps and time costs, improve efficiency 2. Spiral groove, within the processing thread, cutting up to exclude, and was curled applied internally threaded through holes Package include: 6 x Compound Tap Drill Bits 1 x Automatic Center Punch Tool 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. 【Customer Service】Contact us if you are not satisfied with it for any reason. And we promise all the issue will be solved within 24 hours.
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