Aluminum Square Tube, Aluminum, 6061, T6, Square, 24 in Overall Length, 5 5/8 in Inside Width, 5 5/8 in Inside Height, 6 in Outside Width, 6 in Outside Height, 0.188 in Wall Thickness, Wall Thickness Tolerance +/-0.015 in, Fabrication Extruded, Heat Treatment Tempered, Heat Treatable Heat Treatable, Mechanical Finish Mill, Yield Strength 40,000 psi, Tensile Strength 45,000 psi, 95 BHN Brinell Hardness, 60 HRB Rockwell Hardness, Includes Material Certificate Material Certificate with Lot Number