1,Tricone bit,rock bit,three tooth triconebit 2.certified by ISO,API ... high flexibility, high temperature, high wear resistance.2. High-precision metal seal.3. Locking roller ball, to adapt to 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 ...