These brackets are made of strong, solid steel, and have a weight capacity of up to 75 pounds! The beveled holes assure that the screws fit flush to the bracket, for a clean and finished look. Shelf holders go up quickly, easily, and securely with the included hardware. Installs on Brick, Drywall, and Concrete Walls. Wherever they are installed, these brackets with a matte rustic iron finish and color-matched hardware instantly add rustic industrial charm to your home.