Box contents: the tapping tool kit contains M3 M4 M5 M6 M8 M10 M12 which perfectly meet your different needs. Nitriding coated machine screw taps improve performance abrasion resistance, surface hardness and anti-erosion ability of the thread. HSS thread taps convert crumbs into upward spiral chip removal, suitable for tapping new threads or repairing damaged threads. The metric thread tap set can be used with wrenches hand taps, drill presses, threading machines, CNC machines and milling machines, easy precision and fast tapping. Smooth cut - Spiral groove helps remove dirt and not easily broken the faucet. Good tapping and drilling performance, high precision and speed improve work efficiency and quality. Chip evacuation design - Spiral taps are good on thread, fast with great precision, smooth chip evacuation, smooth cutting surface, no residue, with good machinability, it can press the button of the blind hole. Widely used - For tapping all hole applications through holes in low carbon steels, stainless steel, alloy steels, aluminum, copper, metal and wood. Widely used for tapping most low and high carbon steels , stainless steel, alloys, aluminum, copper, metal, wood, etc. Our service: We are committed to providing you with satisfactory service. If you have any questions, you can contact us at any time. We will reply to you within 24 hours and try our best to resolve the problem for you.