These deck rail brackets are adjustable and are designed to install over either a standard 2"x4" or a 2"x6" railing. They can be used with our Prestige, Presidential, or Provincial collections of vinyl window boxes. These durable and weather resistant vinyl window boxes make a beautiful and virtually maintenance free deck rail box to showcase your beautiful plants and flowers. Deck Rail flower boxes add charm and interest, and create a garden environment on your patio or deck. Includes all necessary hardware, simply bolt the deck rail bracket to the metal window box bracket, and adjust the deck rail to the appropriate width. Your window boxes can be installed and removed easily for maintenance.