Start by cutting a 10-inch-long piece of 1x4. Then measure in 1 inch from each end of the board and bore a 3/16-inch-diameter hole in the back edge. Be sure to make the holes at least 1 1/2 inches deep.
Insert a short, straight Peg-Board hook into each hole, then install the shelf. Because the hooks bend up slightly, the shelf will be tilted back, which helps keep items from sliding off.