The Royal Wire Collapsible Hanging Shelf is a must have item. The Collapsible Hanginh Shelf fits over any standard 2″x4″ and folds down into one flat piece for easy storage and portability. The Collapsible Hanging Shelf is perfect for keeping anything from hat boxes to grooming bags up and out of the way. Shelf is 16″D x 36″W. It measures 40″L x 20″D x 20″H.