... ------------------------------------------------------------------------------------------------------------------------ FeaturesMaterials: H-40,J-55,K-55,N-80,C-75,L-80,C-90,C-95,P-110,Q-125,Type ... STC Grades: H-40, J-55, K-55, N-80, C-75, L-80, C-90, C-95, P-110, Q-125OD: ... .Our company is specializing in the process of oil casing, tubing, casing coupling, pup joint, reducer union, drill pipe coupling ...