Features Steel Material: These spiral tap drill bit is made from high‑speed steel, which is rustproof, strong and durable. High Efficiency: Drilling and tapping in one, one‑step processing, greatly save processing steps and time costs, improve working efficiency. Self‑centering Design: Do not need assistant center drilling or center punching. Giving more convenience. Coating Blue: Surface of these spiral tap drill bit is coated with blue makes these cutters more durable. Widely Used: Multifunction, suitable for drilling, tapping, cutting on soft metal, aluminum plate, iron, etc. 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, M10x1.5Specification  Screw Pitch:mmBlade 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 Note:Not suitable to be applide to steel material, easy to break. Package List 6 x Spiral Tap Drill