Aluminum Square Tube 6063, Aluminum, 6063, T52, Square, 6 ft Overall Length, 1 in Inside Width, 1 in Inside Height, 1 1/4 in Outside Width, 1 1/4 in Outside Height, 0.125 in Wall Thickness, Wall Thickness Tolerance +/-0.015 in, Inside Corner Shape Square, Outside Corner Shape Square, Fabrication Extruded, Heat Treatment Hardened, Heat Treatable Yes, Mechanical Finish Mill, Yield Strength 21,000 psi, Tensile Strength 27,000 psi, 60 Brinell Hardness, Not Rated Rockwell Hardness