This high-quality knee brace is made from durable 20ga. galvanized steel and is designed to provide reliable support for your carport structure. Outside dimensions are 24"x2-5/8". 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. Manufactured in house by FPM Metals. American made product. Installation hardware not included.