API Casing Tube 1.Grade: J55,K55,N80,P110 3.Thread: BTC, ... .Standard: API 5CT 5.Place of Origin: China API Casing Tube-----------------------------------------------------------------------------------------------------------------Features Materials: H-40,J-55,K-55,N-80 ... .Our company is specializing in the process of oil casing, tubing, casing coupling, pup joint, reducer union, drill pipe coupling ...