Tricone Bit, Drill Bit, PDC Bit manufacturer / supplier in China, offering API 7-1 Standard 8-1/2 Inch PDC Bit with 4 Blades for Oil Petroleum Water Mining Rock Well Drilling, API 7-1 Standard 8-1/2 Inch PDC Bit with 6 Blades for Oil Petroleum Water Mining Rock Well Drilling, 660.4 mm IADC 117 Steel Tooth Oilfield Well Drilling Tricone Roller Bit 26 Inch API 7-1 Gas Geothermy Well Drilling Milled Tooth Bit Mining Rock Roller Bit and so on.