General description These 4 Pieces Invisible Shelf Brackets are designed for heavy-duty support of wall shelves. Made from high-quality cast iron, they provide a sturdy and reliable solution for displaying your wooden shelves while maintaining a clean and minimalist look. Technical specifications Dimensions: 20 * 15 cm Diameter: 1.2 cm Recommended thickness of wooden boards: 2.5-4 cm Weight capacity: up to 50 kg+ Other information Includes all necessary screws for installation Powder coated finish for improved corrosion resistance and rust prevention