Pottery Barn Alcott Glass Shelf - New in box from website: "Harkening back to the bath fixtures in turn-of-the-century New York City hotels, our Alcott Glass Shelf features square bars and stepped back plates. 24" Shelf: 27.75" wide x 5.25" deep x 3" high Shelf is crafted of tempered glass. Mounting brackets crafted of zinc alloy and brass. Sealed with a clear protective lacquer. Mounting hardware included. Back Plate (2): 2.5" square Maximum Weight Capacity: 20 pounds"