well drilling pipe 60-139mm G105/S135/E75/R780/DZ50 EU/IU/ ... /R2/R3 large manufactuer .best price,products and ser drilling pipe specifications: ø40,50, 60,73,89,114,127,139 ... Drill pipe material: DZ50, R780, G105, S135 Joint material: 40Cr, 45Mn2, ... anyone to our factory to check our strength ,our equipments,our workmanship and our precise tools.We are expressing our ...