Dimension range(OD inch): 4-1/2---20 Dimension range(OD mm): 114.3---508 Standard: API SPEC 5CT Pipe Type: Seamless (SMLS) Main Steel Grade: H40, J55, K55, N80, N80Q, L80, T95, P110 etc Type of Casing: Plain, BTC, STC, LTC, Other Premium Thread Length:R1(4.88-7.62m), R2(7.62-10.36m), R3(10.36-14.63m) Surface Treatment: Anti-corrosion Water Based Paint Packing: Protection Caps on both ends and in bundles with steel strips and two tags as per export requirements Application: Used as the architectural retainer for the walls of oil, gas wells If you consider the casing and tubing of our business piping project, please call and quote. Hebei Borun Petroleum Pipe Manufacturing Co.,Ltd is a famous steel pipe supplier in China. We can provide the items you need. The timely delivery orders are all over the world. Feel free to contact us if any further questions,we will serve you as soon as possible.