2 3/8-5 inch API 5DP Drill Pipe/Oilfield Drilling Tools: Grade:DZ50,G105,S135,R780 OD:42-127mm ... Details:2 3/8-5 inch API 5DP Drill Pipe/Oilfield Drilling Tools :Grade: DZ50,R780,E75,X95,G105,S135Material:40Cr ... plant.2. Longway has advance production lines, adopts to American equipment.3. Longway produces drill pipes strictly meeting API 5DP and ...