Arlington 28" Gardnpost for Flat Gc - Dual Power/Low Voltagegard n post. 28" ballard kit only for devices. opennings on both sides of post for back to back power or power on one side and low voltage on the other. metal support post attaches to surface. the non metallic gard n post slides over the support post. two 1 2" knockouts. color black. color is permanent, no chipping. with grounding clip. Package size: 1 Click here for spec sheet