Factory Drilling Bit for HDD 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:Pilot Tricone Bit for HDD Rock Drilling Next:Top Sales Pilot Tricone Bit for HDD Drilling