The Arrow Base Kit can help you self-square your Arrow Shed and help level the site during assembly. It also keeps the building and stored items off the ground. This base kit must be assembled with your selected floor finishing option before you start to build your shed. Use the flooring material that best suits your needs, such as wood, patio bocks, or gravel. It can also be used as a form for pouring concrete. The base kit is made from durable hot-dipped electro-galvanized steel. Floor finishing materials are not included. If finishing with wood flooring, use exterior-grade plywood, measured to the base kit dimensions.