Double-Flanged Square Tube Profile, Single-Flanged Tube Profile, Profile Height 1 in, Wall Thickness 1/8 in, Slot Width 5/16 in, Flange Height 1/2 in, Silver, Anodized, Aluminum, Nominal Length 4 ft, 13 Series, Inch, Overall Length 48 in, Profile Width 1 in, Yield Strength 25,000 psi, Number of Open Slots 1, Framing Type Press-Fit, Tube Profile Type Double-Flange, Resistance Properties Corrosion Resistant .