6Pcs Titanium Combination Drill And Tap Bits Set, 1/4" Hex Shank, Metric M3-M10 6PCS 1/4" Hex HSS Combination Screw Tap Drill Thread M3-M10 with Automatic Center Punch Tool Specification: Description : Features : Package include: 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. ?100% Satisfied ? Contact us if you are not satisfied with it for any reason. And we promise all the issue will be solved within 24 hours. Please Note: If you recevie the package is not include the Center Punch, please contact to us. We will slove this problem at soon! . Material: Titanium Combination Drill taps are made of HSS 4341, High hardness, rustproof, solid and dsturdy; Each tap drill is engraved with a size making, which is convenient for you to choose the size that suits you. Easy Use: Fast replacement composite cone, uses drill edged principle. Drilling and tapping in one, one-step processing, greatly save processing steps and time costs, improve working efficiency. Metric: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5.Shank:1/4 inch (6.35mm) hex quick-change shank, fit Electric hand drill, impact drill, bench drill, electric screwdriver and other tap machines. Automatic Center Punch Tool: The Automatic Center Punch delivering an automatic spring-driven strike when pressed against surface, it can be adjusted cap regulates striking force. Widely Use: Suitable for drilling, tapping, cutting on soft metal, aluminum plate, iron, etc. Note: Low Speed and Cutting holes in materials (Thickness: 3mm)