... Easy to install 2, attractive apprance 3, low cost steel roof construction structuresSome information about the products .1. ... inch thick steel2 Diagonal Support Beams are square HSS steel tubing, 4 inches by 4 inches, .125 ... -Car Carport, we need 6 Roof Support Beams.Rectangular HSS steel tubing 10 feet long, 6 ... inches, .125 inches thick.25 inch thick Steel Foot plates (Cleats) welded to each end, ...