Features 1、These spiral tap drill bit is made from high‑speed steel, which is rustproof, strong and durable. 2、Multifunction, suitable for drilling, tapping, cutting on soft metal, aluminum plate, iron, etc. 3、Surface of these spiral tap drill bit is coated with blue makes these cutters more durable. 4、Self‑centering design, do not need assistant center drilling or center punching. Giving more convenience. 5、Drilling and tapping in one, one‑step processing, greatly save processing steps and time costs, improve working efficiency. Specification Item Type: Spiral Tap Drill Bit Material: High‑Speed Steel Purpose: Three in One (Punching --- Tapping --- Deburring) Range Of Application: Suitable For Processing Soft Metals (Such As Aluminum Alloys, Zinc Alloys, Tin Alloys), Thin Wood Boards, And Plastics With A Thickness Of Less Than 5 Mm Specifications: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5 Specification Screw Pitch:mm Blade Lenth:mm Handle Length:mm Overall Length:mm M3 0.5 40 27 67 M4 0.7 40 27 67 M5 0.8 41 27 68 M6 1 41 27 68 M8 1.25 44 27 71 M10 1.5 46 27 73 Package List 6 x Spiral Tap Drill