Package Content: 4Pcs 4-Inch Shelf Bracket, 8Pcs Strong Screws, 8Pcs Wall Plug Made of Cold Rolled Steel matte black powder coated design, widely used in home and office areas. Ingenious design creates the illusion that your shelf is floating, enhance the flexibility of space. Heavy duty welded construction so wont bend or break - solid steel supports up to 50 lb, and support shelf from 5" to 8" Quick and easy installation, just simply drill a hole in the shelf to fit the diameter of the rod and screw into the wallSpecification: Total Size: 2.4" x 0.78" x 4.05" / 61 x 20 x 103mm(L*W*H) Rod Diameter: 0.39" / 10mm Rod Length: 3.93" / 100mm Distance Between Hole Center and Hole Center: 1.49" / 38mm Thickness: 0.13" / 3.5mm Bearing Capacity: 66lbs/30kg(Note: For heavier shelves, add additional brackets to distribute the weight.) Material: High Quality solid cold-rolled steel, durable