... export of drill pipes(API oil drill pipes,flat drill pipes, water drill pipes,non-dig drill pipes and geographical drill pipes), drill collars and ... we are manufactory, we are the source R780 water well drill pipeStandard: API 5DP / ISO9001Steel Grade:G105; S135; E75; ... Material :DZ40,DZ50,R780,N80,G105 We can ensure the drill pipes' sizes meeting the international and domastic standards. Otherwise ...