Superior 40t Swivel for HDD Drilling Rod Beijing Superior Drilling Equipment Co., Ltd. Base Info Model NO.:40Customized:CustomizedStandard:JIS, AISI, APILength:Stub-lengthType:Twist Drill BitMaterial:High Carbon SteelUsage:Well DrillingTrademark:SuperiorOrigin:Hebei Description Pre:API Standard Drill Pipe for Water Well/Oil Well Drilling Next:42 Inch TCI Tricone Bit Cutter HDD Rock Reamer for Trenchless Drill Bit