Features: Material: Made of iron, its 3mm/0.12inch back plate and the decorative iron style connection will make sure your board is secured. Rust Proof: Painted black or white, it's smooth and rust-proof. These brackets are a good choice for your book shelf, garden decor and etc. With Screw Holes: 4 screw holes on each bracket, make sure the bracket is well secured first, then fix your board on it. Wide Application: The wall mounted shelf support clamps are suitable for making custom shelves in stores, workshops, backyard, trailer, kitchen, balcony, bathroom and more. Quantity: Package includes 4pcs thick shelf brackets, meet your daily needs. Specifications: Item Type: Shelf Brackets Material: Iron Color: Black, White Size(L*H): About 150*115mm/5.91*4.53inch, About 200*126mm/7.87*4.96inch, About 250*164mm/9.84*6.46inch Thickness: About 3mm/0.12inch, Width: About 25mm/0.98inch, Hole Diameter: About 6mm/0.24inch Package Includes: 4Pcs * Shelf Brackets