Elderlee, Inc. 9901.30005 2 3/4 x 5/16 Inch Bolt Sign Mounting Hardware, Galvanized Steel, 5 Sets Hardware used to mount flat sheet sign to U-Channel or square sign post Includes ten 2 3/4 x 5/16 inch bolt, lock, nut, and nylon washers Easy to install with no special tools required Galvanized steel for maximum durability Five sets of sign hardware