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Thread Size: M2.5 (2.5mm) / Pitch - 0.45mm. HSS COBALT high speed steel with titanium (TiN) coating - high hardness and the titanium coating gives this tool better wear and heat resistance making it a more durable long lasting threading tap For tapping holes in hard metals, stainless steel, special acid resistant steels, CR-NI, aluminium, aluminum plate, iron, ABs, perspex etc Spiral point taps - great for tapping through holes. Also these taps have a self centering point which eliminates the need to pre-centre drill the hole. Can be used for cutting new threads and repairing damaged threads These can be used in a machine or by hand, Manufacturer: Rennie Tool Company