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1. api drill pipe 1.OD.: 21.3mm-609mm WT.: 2mm-22mm 2.Material:H-40,J-55,K-55,N-80,C-75,L-80,C-90,C-95,P-110,Q-125 Standard API 5CT,SY/T6194-96 Size OD:21.3-609MM WT:2-22MM Length:6-12m Material H-40...