Excellent Quality: These invisible shelf brackets are made of high-quality 3mm thick solid iron with a maximum load capacity of 40 kg/90 lb per pair when properly installed. Smooth edges, sturdy, oxidation-resistant, rust-proof, and durable. Unique Design Style: Our invisible shelf brackets feature a matte black finish that can create a rustic style in your room. The finely brushed surface enhances corrosion and rust resistance, giving it an elegant, glossy finish; the smooth, thin edges make it safer and protect your hands. Wall Decoration: These metal shelf brackets make good use of available wall space and help keep the room tidy, elegant, and beautiful, fitting all interior styles. Perfect for displaying potted plants, books, toys, ornaments, and crafts. You Get: 4 black 23 cm shelf brackets, 36 screws of various sizes, and 16 long screws. 16 short screws and 16 wall plugs for wooden boards 23-28 cm wide. Perfect for immediate mounting on wood or concrete walls. If you need to use the floating shelf for heavier loads, or if the floating shelf is too long, you can add additional brackets. Usage Scenario: Matte polished black surface. The heavy-duty industrial shelf bracket is suitable for bedrooms, living rooms, kitchens, hallways, bars, hotels, etc. The minimalist black industrial design adds an unexpected touch to your decor.