Specification:  Product name: Tap drill bit;  Model number: B82685;  Material: High Speed Steel 6542;  Shank: 1/4" (6.35mm) hexagon shank;  Coating: Blue Nano Coated;  Size: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5.     Features:   1. The blue nano coating will protect you drill bit well and make a better drill performance and use life;  2. High hardness, rustproof, solid and durable;  3. The advantage is opening, tapping, chamfering;  4. Self-centering point, do not need assistant center drilling or center punching;  5. Suitable for drilling, tapping, cutting on soft metal, aluminum plate, iron, etc;  6. Drilling and tapping in one, one-step processing, greatly save processing steps and time costs, improve working efficiency;  7. HSS6542 (M2) is of higher hardness and more durable than the HSS4341, and is suitable for cutting the steel even the 2mm 304 steel.     Package Included:  6 x Tap drill bits