Revolution wasted space in your kitchen with the Rev-a-Shelf Base Filler Pull-Out Between Cabinet Organizer.Normally a "filler" or extra space is covered with a decorative front, but Rev-a-Shelf's line of fillers turns that otherwise wasted space into a functional storage area. Fillers are intended to be installed in new kitchen cabinet construction and will not work in existing cabinets. This model is a 3-inch wide design and features adjustable shelves with chrome rails and full-extension ball-bearing slides. This package contains 1 wood filler and 3 adjustable shelves with chrome rails.