4pcs Floating Shelf Bracket, Metal Invisible Shelf Bracket, Heavy Duty Hidden Shelf Bracket, Invisible Wood Shelf Bracket. These shelf brackets are made of solid galvanized steel with a nickel coating and matte black powder coat finish. Designed to resist rust and bending, they offer durable support for long-term use. The hidden shelf bracket system is engineered to be mounted inside the wall and within the wooden shelf, creating a clean, floating appearance. Once installed, the brackets are not visible, allowing for easy cleaning and a seamless look. To install, rout a 5-inch long hole (using a 0.5 inch router bit) into the back of the shelf board. Ensure the board is at least 0.8 inches thick. Secure the bracket to the wall using two included screw holes, then insert the shelf into the bracket. Ideal for space-saving installations, these concealed brackets allow multiple shelves to be placed close together without external supports. Suitable for use with decorative floating shelves, they provide reliable support while enhancing the aesthetic of your space. Material: Galvanized solid steel, surface nickel plated with matte black powder coating. Color: Black. Size: 128x20x63mm. Package includes: 4 pcs invisible shelf brackets.