Comparison : Item # 45,647, Steel A500/A513 Rectangle Tube 1x0.5x0.065x12"
Item # 45,648, Steel A500/A513 Rectangle Tube 1x0.5x0.065x24"
Item # 45,649, Steel A500/A513 Rectangle Tube 1x0.5x0.065x36"
Item # 45,650, Steel A500/A513 Rectangle Tube 1x0.5x0.065x48"
Item # 45,651, Steel A500/A513 Rectangle Tube 1x0.5x0.065x72"