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Heller HSS Co Cobalt Twist Drills DIN 338 RN Heller 26604 8, This set from Heller includes 50 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 1mm to 5.9mm in 0.1mm steps. Heller 26604 8 0990 HSS Co Cobalt Twist Drills DIN 338 RN Set 50 Piece
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