The SWLCBP17 aluminum plate comes standard in pairs with the 1-6 ft. Scrim Werks™ light column packages and 1 together with a 24"x24" plate in the 7-10 ft. packages. It features multiple bolt holes for diverse Column pole configurations, and a center bolt hole for securing lights, attaching to another light column plate, or attaching the SWLCSPKSTUD Light Column speaker stud adapter.