Floating Wall-Mount Av Shelves Are 5Mm Thick Black Tempered Glass With An Unobstructed Surface - Shelves Are Height Adjustable Along The 13.6In Wall Bracket - Steel Brackets Support 15.4Lbs Per Shelf; Aluminum Wall Bracket Is Sturdy And Lightweight; Tempered Glass Is More Resisitant To Scratches/Shattering - Mounts To A Single Wall Stud/Concrete Wall (Wood Screws/Concrete Anchors Are Included) - Cable Management Cutouts Along The Wall Mount Bracket; Pre-Scored Knockouts On The Top/Bottom Caps.