Rev-A-Shelf''s fillers revolutionized otherwise wasted space in your kitchen. Normally a "filler" or extra space is simply covered up with a decorative front for either your wall (upper) or base (lower) cabinets, but with Rev-A-Shelf''s line of fillers, it turns that otherwise wasted space into usable space. Fillers are intended to be installed in-between (2) cabinets in new kitchen cabinet construction and will not work in existing kitchen cabinets. Fillers are available in different widths and heights. (always good to consult with a kitchen designer to incorporate into your new kitchen.)-Included: (1) Wood filler, (3) adjustable shelves with Chrome rails and mounting hardware-Slide Type: 100lb Full-Extension Ball-Bearing Slides-Once installed simply attach your matching panel or door-Fillers do not go inside of a cabinet, they install in-between cabinets-Adjustable and/or removeable shelves-Designed for exactly a 6" W x 30" H opening-Construction: Fully Assembled Maple Wood construction with a clear coat finish for durability-Comes fully assembled and ready to install