... Square Steel Pipe : 1. More Thickness: 3.0-22.0mm 2. Advanced Roller Extrusion equipment line. 3.Certification:CE,ISO SpecificationsSquare Steel Pipe ... steel, Seamless steel, Alloy steel.3. SURFACE:Bared, Galvanized, Oiled, Color Paint, 3PE; Or Other Anti-corrosive ... three-dimensional garage, exhibition hall.(4).Decoration: wrought iron doors and windows, outdoor advertising, pavilion and vestibule, ...