Galvanized Pipe Out Diameter: 10.3mm - 406.4mm Thickness: 0.6mm – 20.0mm Steel Grade: Q195-Q345, S235JR, S275JR, S355JR, Gr. B-D Standard: GB/ T 3091-2001, BS1387-1985, DIN EN10025, EN10219, ASTM SCH40, ASTM SCH80 Surface Finish: hot dipped galvanized, electro galvanized, black Note: Pre-galvanized round hollow section with OD 19mm-100mm and thickness 1mm-2.3mm are also available.