O-GAUGE TAPERED CONCRETE PIER - Single track square rectangular tapered concrete pier. Stand alone or stack as extender on either pier base. Dimensions: 5-1/4"W x 4-1/2"H x 1" thick. (Concrete pad measures: 4-1/2" x 1") Super 3-Dimensional Urethane Casting. Ready to use! Look of poured concrete construction. Gray primer base finish. Weathering recommended. Single Track Design. Slight taper. Concrete cap. (4-1/2" x 1" wide). May be stacked on Center Bridge Pier (FL6302). May be stacked on End Bridge Abutments (FL6305) (( 2 are recommended.))