... Range:1) Round pipe diameter: 8mm-3000mm, thickness: 0.4-60.0mm2) Square tube: 10 x 10mm-1000 x 1000mm, thickness ... : 0.6-60.0mm3) Rectangle tube: 15 x 10mm-800 x 500mm, thickness ... : 0.6-60.0mmB: Surface finish: black, blank, bright and galvanized, or painted ...