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Heller HSS Co Cobalt Twist Drills DIN 338 RN Heller 17735 1, This set from Heller includes 6 HSS Co cobalt twist drills equipped to tackle the toughest drilling jobs in stainless steel and metal. They are made from a special HSS steel with a 5% cobalt content. This set includes drills ranging in diameter from 2mm to 8mm. Heller 17735 1 0990 HSS Co Cobalt Twist Drills DIN 338 RN Set 234568mm
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