Excellent Quality: The invisible shelf brackets are made of high-quality solid iron with a thickness of 3mm and a maximum load capacity of 40KG/90LB per pair when properly installed. Smooth edges, sturdy, oxidation-resistant, rust-proof, and durable. Unique Design Style: Our invisible shelf brackets have a matte black appearance that can create a rustic style for your room. The fine brushed surface improves corrosion and rust resistance and gives it an elegant and glossy finish; the fine smooth edges make it safer and protect your hands well. Wall Decoration: The metal shelf brackets make good use of the available space on the wall and help keep the room clean, elegant, and beautiful, and are suitable for all interior styles. Ideal for displaying potted plants, books, toys, ornaments, and crafts. You Will Receive: 4 black 23cm shelf brackets, 36 screws of different sizes, 16 long screws, 16 short screws, and 16 wall plugs for 23-29cm wide wooden boards, immediately perfect for