1,Tricone bit,rock bit,three tooth triconebit 2.certified by ISO,API 3 ... Da Co.Ltd. will occupy China's market in the near future through our consistent efforts.Tricone bit1.High-strength, ... high toughness carbide teeth,5. Hours in the rotary cone bit with the impact, crushing and shearing the role of ... broken rock.6. Cone bit to adapt to the soft, medium and hard of various ...