Gas and Water tube OD:1/4" ~ 24" 16 ~ 610 mm ... for oil well, boilers, precision machines, petro-chemical, ship, structure pipe, automobile,shock absorber,building, geology, fluid tubes, line ... pipe etc4Mill Certificate Mill Test Certificate will provide 5Length 5.8m ... TIANJIN port 14Certificats ISO9001 API5L API5CT TS16949 ISO14001 oil and gas pipe