API Casing Tube 1.Grade: J55,K55,N80,P110 3.Thread: BTC,LTC,STC 4.Standard: API 5CT 5.Place of Origin: China API Casing Tube-----------------------------------------------------------------------------------------------------------------Features Materials: H-40,J-55,K-55,N-80,C-75,L-80,C-90,C-95,P-110,Q-125,Type of End-finish: Plain, BTC, LTC,STC Grades: H-40, J-55, K-55, N-80, C-75, L-80, C-90, ...