Aluminum Rectangular Tube, Aluminum, 6061, T6, Rectangular, 12 in Overall Length, 8 in Outside Width, 3 in Outside Height, 0.25 in Wall Thickness, Fabrication Extruded, 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, System of Measurement Inch