We are Tianjin Tiangang Special Petroleum Pipe Manufacture Co., Ltd, with over 10 years' experience in manufacturing and selling casing and tubing according to API-5CT standard casing from: 5-1/2''(139.7mm)---20''(508mm) , Pipe end type:BTC/ LTC/ STC , Steel grade:J55/K55/N80/L80/P110 ETC. Length range:R1 / R2 /R3 Tubing from:2-3/8''(60.32mm)---4-1/2''(114.3mm) , Pipe end type:EUE /NU , Steel grade:J55/K55/N80/L80/P110 ETC.Length range:R1 / R2 / R3 Coupling from:2.2''(55.88mm)---21''(533.4mm) , end type:BTC/ LTC / STC / EUE / NU Steel grade:J55/K55/N80/L80/P110 ETCand pls contact Mr Richie and send email to to richie_casing at yahoo cn for kindly details and welcom your inquiry!