Why Choose Premium STROTON Cobalt Drill Bits?
Researches have shown that compared with HSS without cobalt, HSS with cobalt has higher temperature resistance, red hardness, wear resistance and heat treatment response.
- Red hardness, which means that the drill bits hardened steel can maintain hard at 860-880℃.
- 68 HRC,it means that the drill bits has 3X cutting ability and 3X durability.
- This drill bits set is made of True Premium Cobalt (80,000 dollars per ton).