Copper Top Solar LED Light 6" x 6" Post Caps for Bridges, Fences, Decks, & Posts No Wires, No Electricity, & No Hassles! Easy to install and maintain Light up your deck or porch day and night Two AA Ni-Cad Rechargable Batteries ensure longer lighting power up to 12 hrs of light Will fit on any 6" x 6" post only. The outside dimensions of a normal 6 x 6 measure 5 5/8 x 5 5/8