High Quality Superior Crossover Sub Beijing Superior Drilling Equipment Co., Ltd. Base Info Model NO.:crossover subCustomized:CustomizedCertification:ISOUsage:Pup JointMaterial:Carbon SteelTrademark:SuperiorTransport Package:Wooden BoxOrigin:China Description Pre:New and Superior Bit-Oriented for Soft Formation in None Excavation Next:3D V Type Cutter (Router bits EM3DV) V Slot Cutter V Shape Knife