... Co., Ltd which found in 1996 specially manufactures a series of petroleum drill pipes and joints. Its total asset is 50 ... points as follow:1. Longway is a real manufacturer of drill pipes in China and has its own plant.2. ... 5DP / ISO9001Steel GradeG105, R780, S135, E75, X95, DZ40, DZ50SizeRSDWeightODWall thicknessOD of Tool jointUpsetinchLb/ftkg/mmmmmmm2-3/8NC266.269.3260.327.1185 ...