OD 1/2" TO 10" WT 1.0MM TO 16MM Zinc Coating: 200-480g/m2 Features and specifications:1) High-frequency welded2) Outer diameter: 15-323mm3) Thickness: 0.5-10mm 4)Steel grade: SPHC, 08AL, 08F, HG5, DF08, Q195-235, M85)Standards: ASTM, API, JIS, DIN, EN, BS, GB