This high-quality knee brace is made from durable 20ga. galvanized steel and is designed to provide reliable support for your carport structure. Offered in two sizes. Outside dimensions are 24"x3" or 36"x3". Inside opening is 2-1/2". Four holes are predrilled to accommodate a #12 screw to assist in easy installation. Perfect for those in need of a reliable solution to keep their carport in top condition. Installation hardware not included.