Weight Loading Capacity: 4 shelves will hold as much as 200 lb when mounted to the wood or brickwall. These floating shelf brackets are made of 100% solid steel rod, stronger than the iron rod in the market, and are powder coated to be rustproof and provide strong support. Good Value Set: SoLd in 8pack Floating Shelf Brackets can meet more of your daily needs, save your money. You can use these brackets in more shelves, cost less. Sturdy Floating Shelf Hardware: The brackets will hide inside the shelf, and the shelf will be floating. With hidden floating shelf now you can hang all your shelves without having to worry about ugly metal accessories ruining your home decor. Space Saver: Our Floating Shelf Brackets are the perfect added-storage solution for homes where space is limited, ideal for the kitchen, bathroom, bedroom, office & more. Help you save space to the greatest extent, increase space flexibility and expand your house storage space. Quick and easy installation: Just follow the simple instructions, use the drill DIY tools, Drill a 0.39 inch dia and 4 inch deep Hole in your shelf, mount the bracket to wall, slide shelf onto bracket. Features:
1.Made to be invisible while floating your wood shelving
2.Easy to mount and level to any wall surface - dry wall, concrete wall, brick wall.
3.100% matte black powder coated solid steel

Specification:
Material: High Quality solid cold-rolled steel, durable
Mounting Base Size: 2.4" x 0.78" / 61 x 20 (L*W)
Rod Diameter: 0.39" / 10mm
Thickness: 0.13" / 3.5mm
Distance Between Hole Center and Hole Center: 1.49" / 38mm
Available Rod Length: 3 inch or 4inch, up to your needs
Bearing Capacity: 66lbs/30kg(Note: For heavier shelves, add additional brackets to distribute the weight.)