9-5/8'' Casing Coupling/K55 or J55/API 5CT 1.Standard:API 5CT ,5B 2.Size:2-3/-20" 3.Grade: k55,j55,n80,n80q,p110 ... Beijing, near Tianjin port, the largest port in north of China. With API 5CT oil casing and API 5L oil line pipe ... the main products,with production and sales integration, professional domestic and foreign trade operations, strength financial , rich experience.9-5/8'' Casing Coupling/K55 ...