we manufacture drill pipe: O.D.46-168mm W.T. 4-10mm Standard: ... SPEC 5D, API SPEC 7 Grade: E75, X95, G105, S135 drill pipe: O.D.46-168mm,W.T. 4-10mm, Standard ... SPEC 5D, API SPEC 7 ,Grade: E75, X95, G105, S135. Drill Pipe Standards:API SPEC 5D, API SPEC 7 Grade:E75 ...