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Specifications: M3×0.5, M4×0.7, M5×0.8, M6×1.0, M8×1.25, M10×1.5, M12×1.75 that you can use for tapping various threads.? Material: high speed steel 4241/ bearing steel, suitable for soft metal, such as aluminum plate, iron plate. High speed steel 6542, suitable for ordinary stainless steel and other hard materials.? Standard thread distance design, clear and tidy, no burr.? One set including 8 tools?M3 M4 M5 M6 M8 M10 M12 with Adjustable Tap Wrench 1/16-1/2''.? These machine hand taps are used for machining nuts or other common thread on the machine.