API 5dp Friction Welding Drill Rod 2 3/8" G105 Tool Joint AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API Spec 5dp Friction Welding Drill Pipe/Drilling Pipe 2 3/8" G105 Tool Joint AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API Spec 5dp Friction Welding Drill Rod 2 3/8" G105 Tool Joint AISI 4137h Hebei Shitan Machinery Manufacturing Co., Ltd. API 7-1 Oil Heavy Weight Drill Rod/Drill Pipe O. D 168.3mm AISI 4145h Hebei Shitan Machinery Manufacturing Co., Ltd. API 7-1 Heavy Weight Drill Rod/Drill Pipe O. D 168.3mm AISI 4145h Hebei Shitan Machinery Manufacturing Co., Ltd. API Spec 7-1 Oil Heavy Weight Drill Rod/Drill Pipe O. D 168.3mm AISI 4145h Hebei Shitan Machinery Manufacturing Co., Ltd. API Spec 7-1 Heavy Weight Drill Rod/Drill Pipe O. D 168.3mm AISI 4145h Hebei Shitan Machinery Manufacturing Co., Ltd. API 7-1 Oil Heavy Weight Drill Rod/Drill Pipe O. D 139.7mm AISI 4145h Hebei Shitan Machinery Manufacturing Co., Ltd. API 7-1 Heavy Weight Drill Rod/Drill Pipe O. D 139.7mm AISI 4145h Hebei Shitan Machinery Manufacturing Co., Ltd. API Spec 7-1 Oil Heavy Weight Drill Rod/Drill Pipe O. D 139.7mm AISI 4145h Hebei Shitan Machinery Manufacturing Co., Ltd. <<<3637383940>>>