The WRB18 is an easy to install two piece cast aluminum base that will cover the mounting plate, gussets and J-Bolts of our surface mount poles. This base includes inter-changeable inserts that allow the base to easily fit around 3″ O/D, 4″ O/D and 4″ x 4″ square poles. Decorative bases such as the WRB1, WRB5 may sit on top of WRB18 base to match existing site furnishing decor.