Made of High Quality Cold Rolled Steel, Baking Finish. Smooth Surface,Rustproof. . 90-Degree Bent, Hidden Solder Joint. It May Looks Thin and Simple, But It Has A Strong Triangle Structure Which Provide A Lot Weight Bear Capabilities. Our Test Proves That After You Put A Shelf On Them Which Makes It Evenly Stressed, Each Pair of Brackets Can Hold Up to 30Kg, About 66Lb (Mounted On Concrete Wall). . Dimensions: Thickness-2 Mm(0.08 Inch),Width-16 Mm(0.63 Inch).Side Length-95Mm*150Mm(3.74 Inch * 5.9 Inch), 120Mm*200Mm(4.72 Inch * 7.87 Inch), 160Mm*250Mm(6.30 Inch * 9.84 Inch). . Easy to Install: It Comes with All Hardware You Need, 2 Long Silver Screws and 2 White Plastic Plugs for Mounting,2 Or 3 Short Silver Screws for Each Bracket. . Perfect Choice for Space Saving, Home Decoration. Its Practical and Not Expensive. If You Have Any Problem with The Product Like Missing Components, Damaged, Wrong Size and Etc, Please Contact Us. .