Just like little pieces of furniture, these solid-maple spice racks are held together with mortise and tenon joinery, so that they will stay together, whether you stand them on your counter or mount them on a wall. The 2 shelf rack holds up to 12 spice jars, the 3 shelf rack will accommodate up to 18 bottles. The 2 shelf rack measures 12.5" wide and 12" high, the 3 shelf rack is 12.5" x 18". Both are 4" deep with angled shelves to keep bottles from falling.