We are one of the most professional suppliers of casing, tubing, line pipe, sucker rod and other oilfield equipments in China. We provide quality products with competitive price, timely delivery and customized services. The casing spec. is as follows: 1. Size:4 1/2" , 5", 5 1/2", 6 5/8", 7", 7 5/8", 9 5/8", 10 3/4", 13 3/8" , 16", 18 5/8", 20" 2. Tthread: Short round thread, long round thread, buttress thread (STC, LTC, BTC, Premium Connection) 3. Steel grade: J55, K55, L80, N80, C90, T95, P110 4. Length range: R1, R2, R3 Tubing spec. is as follows 1.Size:1.9, 2 3/8", 2 7/8", 3 1/2", 4 1/2" 2.Connection : NUE, EUE , 8RD, 10RD, Round thread, 3.Steel grade: J55, N80, L80 and P110 Please feel free to contact us if you have any inquiry.