- Manufactured from high quality HSS M35 grade Steel
- 5% cobalt mixture added for extra heat resistance
- Clean precise boring with fully ground flute and cutting tip
- 135 degree split point providing easy non-slip start
4mm HSS Cobalt Drill Bit made of high quality HSS M35 grade steel with 5% cobalt mixture for added heat resistance for tough and hard materials. Fully ground flute and cutting tip for precise boring with 135 degree split point for easy non slip start. Typically used for drilling metal, wood and plastics.