... , Q235, Q345B, SS4004. Specification: 20^20~300^300mm,; Length:6m,9m,10,12m, 5.8 meters for 20' container, 6 meters to 12 meters ... for 40' container.Commodity: Equal Angle Steel BarSize (mm ... )Tolerance (mm)Thickness (mm)Tolerance (mm)20±0.83,4±0 ...