Stainless Steel Square Tube, Stainless Steel, 304, Square, 12 in Overall Length, 2 3/4 in Inside Width, 2 3/4 in Inside Height, 3 in Outside Width, 3 in Outside Height, Wall Thickness 0.12 in, Wall Thickness Tolerance +/-0.012 in, Fabrication Welded, Heat Treatment No Heat Treatment, Heat Treatable Not Heat Treatable, Mechanical Finish Mill, Yield Strength 35,000 psi, Tensile Strength 85 ksi, 195 BHN Brinell Hardness, 92 HRB Rockwell Hardness