The Better Homes & Gardens Solar Powered Landscape Post Cap LED Light for 4'' x 4'' or 6'' x 6'' in. Deck or Fence Posts, Black Finish adds a warm white glow to your favorite outdoor area and is powered by the sun. This LED Post Cap was designed to fit on a nominal 4 x 4 wood fence or deck post. This solar-powered post light has extending capabilities to fit on a 6'' by 6'' post as well. Place in adequate sunlight to enjoy up to 8-hours of all-night illumination. Safely guide your family and guests up and down your staircases, decks, and more with our solar-powered LED post caps. Increase the decor and security in your favorite landscape areas today.