The Copy Picture Holder attaches to your canvas to hold sketches, value studies, books or pictures up to 15" x 15" on a 7" wide shelf. The durable, lightweight aluminum holder attaches to the wood frame of stretched canvas (up to 1 3/4" wide) and adjusts for right or left use. It can also be used with hardboard or canvas panels if they are backed by a stretched canvas, and can be reversed and carried inside a canvas when not in use.