Heavy duty Steel construction Vertical Panel Carts Heavy duty steel platform cart supports multiple sizes of sheet material such as paneling, plywood, drywall or anything that is long, bulky and hard to handle. Ideal for lumberyards and hardware stores. Rolls on (4) 5" x 1½" swivel poly-on-steel and (2) 8" x 2" rigid poly-on-steel casters. Center caster provides great maneuverability.