prefabricated steel structure 1, Easy to install 2, attractive apprance 3, low cost prefabricated steel structureSome information about the products .1. Vertical Support #1 ... , .250 inch thick steel2 Diagonal Support Beams are square HSS steel tubing, 4 inches by 4 inches, .125 inches thick, ... ) For each 6-car Carport, we need 12 pieces of PurlinCEE Steel 27 feet long, 8 inches by 2.5 inches, 12 ...