... 2.Thread:BTC, LTC,STC 3.Standard: API 5CT, ISO 4.Place of Origin: China Casing Pipe------------------------------------------------------------------------------------------------------------------------ FeaturesMaterials: H-40,J ... -80, C-90, C-95, P-110, Q-125OD: from 4 -1/2" to 13-3/8”Length: R1, R2, R3 ...