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Suitable for alloyed and non-alloyed steel, cast steel, cast iron,sintered iron, malleable cast iron, non-ferrous metals, hard plastics. Precision-ground HSS-G drill bit enables up to 40% faster drilling rate and up to 50% lower feed pressure than standard-ground HSS drill bits with a chisel edge. Self-centering split point drill tip means there is no need to pre-punch or pilot drill up to 10mm diameter.