1.Size:1/2" to 24" 2.Thickness:Sch5s-Sch160,XS,XXS 3.Certificate:API,ISO,CCS 4.best quality,lower price ProductionSteel pipeTypeSeamless and ERWSize1/2" To 24"Wall thicknessSch5S-Sch160, XS,XXSStandardsANSI, ASTM,API,DIN, JIS, BS, ISO, GB, SH, AND HG etc MaterialCarbon Steel: ASTM A53/A106,ASTM A179,API 5L X42/52/60Surface treatmentBlack painting, anti-rust varnish, anti-rust oil, hot galvanized, ...