oil tube 1)size:From 4-1/2 to 13-3/8 2)grade: J55, K55, N80, L80, P110 3)standard:API Spec 5 CT oil tube USAGE: To extract oil and gas from the wellMaterialSizeStandard20#Q235φ76×3-4 GB/T8162-1999GB/T8163-1999φ108×4-5φ133×4.5-5φ159×4.5-6φ219×6-8φ273×6-10φ325×8-10φ377×8-10φ426×8-12φ530×9-10φ630×9-10Beijing Metalwork Technology Trade Co., Ltd oil tube (factory)