Mount window boxes 8" wide and smaller along railings using this pair of 7"H x 8"W Deck Clamp Brackets. Made from high-grade metal with a black powder-coated finish, these clamps are rust-resistant for lasting outdoor use. Use the adjustable screws on the bottom of the clamps to grip window box material measuring up to 2" thick. One pair can accommodate up to a 48"L window box. A lip on the front of each clamp measures approximately 1"H and will be visible from the front of the window box.