Wooden shelf brackets are made of solid galvanized and nickel-coated steel with a matte black powder coat finish. These shelf wall brackets resist rust and bending, ensuring a long service life. Despite their compact size, they are sturdy and reliable. Hidden shelf brackets are designed to be installed within the wall and inside the cabinet. After installation, the brackets are not visible. With no external brackets, the furniture is easier to clean. To conceal the brackets in the wood, use a 0.5-inch router bit to cut a 5-inch long pocket hole in the board. Ensure your board is thicker than 0.8 inches. Secure the floating shelf brackets using two screw holes that connect to the wooden floating shelves, then mount the shelf to the wall. When used for decorative shelves, these brackets help save space by eliminating external supports, allowing multiple shelves to be installed close together. These shelf brackets offer strong performance and are ideal for supporting floating shelves. The brackets give your shelf furniture a clean, modern appearance. Specifications: Material: Galvanized solid steel, surface nickel plated with matte black powder coating Color: Black Size: 128x20x63mm Package Includes: 4 Pcs Invisible Shelf Brackets