Fiberglass Square Tube Material Fiberglass Wall Thickness 0.25 in Color Dark Gray Inside Corner Shape Square Outside Corner Shape Square Outside Height 3 in Outside Width 3 in Inside Height 2 1/2 in Inside Width 2 1/2 in Overall Length 5 ft Maximum Temperature 150 Degrees F Resin Type ISOFR Standards ASTM E-84 Tensile Strength 30 000 psi Wall Thickness Tolerance +/-0.038 in Type Square Product Type Square Tube Length Tolerance +/-0.1875 in Minimum Temperature -100 Degrees F