Heavy Duty Shelf Brackets: L-shaped shelf brackets are made of high quality solid steel with a thickness of 0.2 inches/5 mm, which is stronger and will not sag. Each pair of shelf brackets can hold up to 150 pounds when mounted on studs or brick walls. They can easily be placed on bookshelves, kitchen utensils, large fireplaces, plants, decorative items. Invisible Bracket Design: Wooden boards with a thickness of more than 1.6 inches can perfectly block the back panel of the bracket. Once installed, these hidden shelf brackets are completely hidden, creating a stunning floating illusion. Get convenient storage space while maintaining a modern, beautiful and elegant look. PREMIUM QUALITY: Each bracket is made of one-piece molding without welding structure, and the quality is inspected at a 90-degree right angle. Matte black textured powder coat finish resists scratches and rust, making it durable and beautiful. Each bracket is guaranteed to be straight, square and of premium quality.