Standard centre fully ground twist drills with spiral flutes from high speed steel. Produced according to the norms CSN221112 and DIN 333B. They are used for production of holes for firm and live centres, during centering of precisely placed holes.
Standard center ground drills for the production of dimples in cast iron, non-ferrous metals and their alloys, plastics and steel with a strength up to 900 N/mm2.
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