PerformanceFloating shelf brackets last a long time. The brackets are made of iron and ABS plastic, durable and good-looking. Easy InstallationDrill a 7/16 inch hole in your shelf 4.2 deep, mount the bracket on the wall, slide the shelf onto the bracket. Load CapacityThe heavy-duty bar is a hexagonal column, it has barbs and a plastic sleeve, which increases the resistance very well and does not shake smoothly. The inner metal structure also ensures the load-bearing capacity. Load-bearing capacityThe heavy-duty bar is a hexagonal column, it has barbs and a plastic shell, which increases the resistance very well and does not shake smoothly. The inner metal structure also ensures the load-bearing capacity. Package Includes8 shelf brackets, 8-piece complete set with 7.1 cm screws and wall anchors (diameter drill bit of 10 mm suitable).