Heller HSS-Co Cobalt Twist Drills DIN 338 RN
- Heller 21230 4, This 4.2mm HSS-Co cobalt twist drill from Heller is equipped to tackle the toughest drilling jobs in stainless steel & metal. It is made from a special HSS steel with a 5% cobalt content. Sold singly. Heller 21230 4 0990 HSS-Co Cobalt Twist Drill DIN 338 RN 4.2mm
- Single