Easily add a floor to your Arrow 4 ft. x 7 ft. or 4 ft. x 10 ft. shed with this frame kit. The hot-dipped galvanized steel framework is especially crucial if your storage building is situated above grass, gravel or dirt so your valuable items don't sit directly on the ground. Once in place, top the crossbeams with separately-sold exterior-grade plywood (5/8 in. minimum thickness) for the finishing touch on your shed flooring project. Color: Grays.