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Heller HSS Co Cobalt Twist Drills DIN 338 RN Heller 26602 4, This set from Heller includes 41 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 6mm to 10mm in 0.1mm steps. Heller 26602 4 0990 HSS Co Cobalt Twist Drills DIN 338 RN Set 41 Piece
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