Acrylic shelves screw into standard stud walls or masonry walls with two or three screws. The larger sizes have three screw holes. Hardware NOT included. Plastic washers recommended. Manufactured from flame polished, heavy-duty 3/16” thick clear acrylic. Shelves feature solid one-piece construction with rounded corners for safety. Can be used to display a variety of things on walls. Custom wall mount shelves available (minimums apply). Sizes nominal.