150t Swivels for HDD Drill Rod Beijing Superior Drilling Equipment Co., Ltd. Base Info Model NO.:150TCustomized:CustomizedStandard:JIS, AISI, APILength:Stub-lengthType:Twist Drill BitMaterial:High Carbon SteelUsage:Well DrillingTrademark:SuperiorOrigin:Hebei Description Pre:Nature Dimond Bit for Exploration African Next:Low Price 22inch Rock Reamer for Directional Drilling