Drill Pipe, Heavy Weight Drill Pipe manufacturer / supplier in China, offering API 5dp 60.32mm*7.11mm Nc26 Ieu G105/S135 Internal Coating Alloy Drill Pipe, API 5dp 60.32mm*7.11mm Nc26 EU S135 Internal Coating Alloy Drill Pipe, API 5dp 60.32mm*7.11mm Nc26 EU G105 Internal Coating Alloy Drill Pipe and so on.