aluminum square tube 1.out dia 20-250mm 2.wall thk 3-20mm 3.alloy 6063,6061,6A02,3003,etc. 4. top quality,reasonable price aluminum square tube1.Specifications PRODUCTaluminum tubeALLOY1060,2A12,3003,3A21,5A02,5052,6063,6061,6A02 OUT DIAMETER 20-250mmWALL THICKNESS 3-20mmSHAPE round, square ,oval, flat ect STANDARD GB/T 3880-2006APPLICATION machine,construction,decoration,furniture,industry,etc 2 ...