... 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 ... including Drill bits, Drill Pipe, TCI tricone bits, PDC bits, PDC Diamond drill bits, roller rock bits,core bits,all size bits in oilfield,water well drilling,mineral ... ! Contact: janneM.P.: 0086-13784816938 roller drill bit