large factory drill pipes 60-139mm with kinds of models and grades for your need.best price,products and pleasing service Jinzhou City Eastern Exploration Machinery Co., Ltd, a professional and large drilling products manufacturer in China Drill pipe Specifications: ø40,50, 60,73,89,114,127,139Drill pipe material: DZ50, R780, G105, S135 Joint material: 40Cr, 45Mn2, 35CrMo,42 CrMo, 4137H ...