API High Quality Swivel Drilling Tools Beijing Superior Drilling Equipment Co., Ltd. Base Info Model NO.:40tCustomized:CustomizedUsage:Well DrillingTrademark:superior brandTransport Package:Wooden Cases for Sea ShipmentSpecification:all typesOrigin:ChinaHS Code:843143200 Description Pre:API New Superior Crossover Sub for Drilling Next:New and Superior Bit-Oriented for Soft Formation in None Excavation