Deer Park Ironworks Small Solera Window Box with Coco Liner. Decorated by our heavy gauge slat metal design, our window box makes an ideal home for plants or flowers, and it can be easily attached to deck rails or iron railings with the included hardware. It rests perfectly on a window ledge or deck rail, and is made of heavy gauge steel. It has a natural patina powder-coated finish, which makes it weather resistant and long-lasting. It also comes with a fitted coco liner to help retain soil and water for your leafy loves.