Comparison : Item # 50,523, Steel A500/A513 Square Tube 0.5x0.065x12"
Item # 50,524, Steel A500/A513 Square Tube 0.5x0.065x24"
Item # 50,525, Steel A500/A513 Square Tube 0.5x0.065x36"
Item # 50,526, Steel A500/A513 Square Tube 0.5x0.065x48"
Item # 50,527, Steel A500/A513 Square Tube 0.5x0.065x72"