From the brand Product Description 【Excellent Quality】 The invisible shelf brackets are made of high-quality solid iron with a thickness of 3mm, and the maximum load capacity per pair is 40 kg provided that correct installation is ensured. Smooth edges, strong, anti-oxidizing, rust-proof, durable. 【Unique Design Style】 Our invisible shelf brackets have a matte black appearance, which can create a rustic style for your room. The finely brushed surface enhances corrosion and rust resistance and gives it an elegant and shiny appearance; the fine and smooth edges make it safer and protect your hands well. 【Wall Decoration】 The metal shelf bracket makes maximum use of available wall space, helps keep the room clean, tidy and beautiful, suitable for all interior styles. Perfect for displaying potted plants, books, toys, decorations and crafts. 【What you will get】 4 x 5.5 \" black shelf brackets, 32 x screws in different sizes, 12 x long screws, 8 x short screws and 12 x plugs suitable for 6-8.6 \" wide wooden boards, perfectly installed on wooden boards in no time on a shelf or shelf on the concrete wall. If you want to use the floating shelf for heavier loads, or if the floating shelf is too long, you can add additional brackets on top. 【Application Scenarios】 Matte black surface, the heavy-duty industrial shelves are suitable for bedrooms, living rooms, kitchens, hallways or bars, hotels etc. The minimalist black industrial design adds an unexpected effect to your home.