Wooden shelf brackets are made of solid galvanized and nickel-coated steel with a matte black powder coat finish. These shelf wall brackets are rust-resistant and durable, ensuring a long service life. Despite their compact size, they provide strong support. Hidden shelf brackets are designed to be installed within the wall and inside the cabinet. Once assembled, the brackets are not visible, creating a clean, seamless look. Without exposed brackets, the furniture is easy to clean. To install the hidden brackets, use a 0.5-inch router bit to drill a 5-inch long hole into the board. Ensure the board is thicker than 0.8 inches. Secure the floating shelf brackets using two screw holes that fit into 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 reliable performance and are ideal for supporting floating shelves. The design enhances the appearance of shelf furniture, giving it a sleek and look. Specifications: Material: Galvanized solid steel, surface nickel-plated with matte black powder coating Color: Black Size: 128 x 20 x 63mm Package Includes: 4 pcs invisible shelf brackets