All come with a top and bottom cleat. The cleat system is the structural key to secure your garage organization wall. The offering of an extra 16”, 32", and 48" Top and Bottom cleat is for convenience if your wall configuration differs from the regular side-by-side set up or if you wish to hang your horizontally instead of vertically. The 48" top and bottom cleats enables and easier installation for more expansive OmniWall setups.