High Quality: These shelf brackets are made of premium cold-rolled steel, thick metal plate with smooth surface, no rough edges, solid and sturdy, well-made and reasonably strong for heavy use. About Size: The bracket size is 200 x 250mm, the long screws installed on the wall part are m5 x 60, the short screws installed on the shelf part are m4 x 16, suitable for shelves with a thickness of at least 20mm. Easy Installation: Each bracket comes with pre-drilled screw holes to guide you through the process, and comes with complete hardware screws for quick and easy installation of the shelf bracket. Wide Application: These shelf brackets are perfect for DIY shelves to save space, use in your home, bathroom, shop, garage or business, support shelves for your books, potted plants and all kinds of household items. Package Contents: The bracket package includes 4 black brackets and 8 long screws with expansion anchors and 8 short screws, comes with all screws and hardware needed to install a bracket.