steel Tooth Tricone Bit for Water Well Drilling Beijing Superior Drilling Equipment Co., Ltd. Base Info Model NO.:IADC217Customized:CustomizedStandard:APILength:Taper-lengthType:Center Drill BitMaterial:Tungsten CarbideUsage:Well DrillingTrademark:superiorTransport Package:Woodern BoxOrigin:Hebei Description Pre:Factory Direct Sale 8 1/2′′ (215.9mm) IADC 637 IADC/API/TCI Tugsten/Carbide Tricone Roller Bit for Oil/Well Drilling Coal Mining/Equipment Next:Piling Foundation Rock Bit 7 7/8 Inch IADC537