The 48" Arch Decora window box and liner is one of our most popular sizes to fit under a window or on a railing. This Arch Decora window box actually measures 49" in length to accommodate a 48" galvanized liner in a contrasting color. The Arch Decora is 8 ½" in width, and is 7 ½" in height and includes mounting strips for easy installation. Both the Arch Decora window box and liner have been powder-coated to give you many seasons of use and to resist rust and corrosion. Brackets that are sold separately can be used to put this pretty window box on a rail or wall to add color and interest to your home as well. Customization is available for longer window lengths; please contact your sales representative for details by calling 800-896-0978.