Classy Post Cap Colonial SolarFabricated from durable cast aluminum with powder coated finish, the Colonial Solar Post Cap is designed to fit over a nominal 4 x 4 wood post. (Actual dimension of opening: 3 5 8x3 5 8). The attractive Colonial is complimented by using real pebbled glass panels. Built to our stringent quality standards it will stay lit for up to 12 hours. High Performance solar lights stays lit for up to 12 hours Lights up automatically every night auto off switch