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Threaded taps with drilling function, used to drill holes and cut new treads at the same time. Manufactured from HSS alloy steel with nitriding surface finish. Set Includes 6 Standard metric thread / pitch: M3 x 0.5, M4 x 0.7, M5 x 0.8, M6 x 1, M8 x 1.25, M10 x 1.5 For hand drill or lathe use. Supplied in a sturdy storage case.