Nc38 Drill Pipe, API 7-1 Drilling Tools, Nc 26 Tool Joints manufacturer / supplier in China, offering Nc26 E75 4-1/2" 5" Drill Pipe Nc50 Tool Joints, DIN17175 St52 /S355jr Carbon Steel Seamless Pipe, API 5L ASTM A106/A53 B A179/192 T5 T12 P91 /A335 Gr6 Cold Finished Seamless Steel Tubes and so on.