Bop, Mud Pump, Casing Centralizer manufacturer / supplier in China, offering API Nc Connections 4145h Drill Pipe G105 S135 Steel Drilling Rod, API Drill Pipe X95 Nc If Connection for Oil and Water Drilling, API 5dp Drill Pipe Nc26, Nc31, Nc38, Nc50 Connection / Customized Drilling String and so on.