Stainless Steel Rectangular Tube, Stainless Steel, 316, Rectangular, 12 in Overall Length, 3 1/2 in Inside Width, 1 1/2 in Inside Height, 4 in Outside Width, 2 in Outside Height, Wall Thickness 0.25 in, Fabrication Welded, Heat Treatable Not Heat Treatable, Mechanical Finish Mill, Yield Strength 37,000 psi, Tensile Strength 82 ksi, 210 BHN Brinell Hardness, 95 HRB Rockwell Hardness, Includes Material Certificate Material Certificate with Lot Number, Standards ASTM A240