API casing, seamless or ERW casing size from 4-1/2" to13-3/8" and also large size ERW 16", 18-5/8", 20" casing. Grade H40, J55, K55, M65, L80, C95, N80, C90/T95, P110, Q125. Thread and coupling STC, LTC, BTC or Premium connection, length range R1, R2, R3. Except normal casing, we can also provide high collapse casing, economic anti-CO2/H2S casing, anti-corrosion casing, super high intensity casing.