High QualityThese shelf brackets made of premium cold rolled steel, thick metal sheet with smooth surface, no rough edges, solid and sturdy, well made and fairly strong for heavy duty About The SizeThe size of the bracket is 125x150mm, the long screws that install on the wall part is m5*60 ,the short screws which mounted on the shelves part is m4*16, suitable for shelves with thickness no less than 4/5 inches / 20mm Easy InstallationEach bracket comes with pre-drilled screw holes to guide you through the process, and comes with complete hardware screws for quick and easy to install the shelf bracket Wide Range of Applications These shelf brackets are perfect for DIY shelves to saving space, use in home, bathroom, shop, garage, or business, support shelves for your books, potted plants, and all kinds of home items Package ContentThe brackets package include 4pcs black brackets comes with all hardware that are needed to install a bracket