Shelving made with store-bought shelf standards and brackets have a couple of downfalls. First, the brackets don’t allow for very deep shelves. And second, because of the thickness of the standards, there’s a gap left at the back of the shelf that allows things to fall off. To solve both of these problems, I made wider shelves with notches in the back to close the gap (photo, below). A hole in the shelf locks into the front of the bracket, as shown in the bottom photo. The notch in the rear of the shelf wraps around the shelf standards at the back where things can roll off. The hole in front is sized to match the tab on the bracket. This locks the shelf in place, and lets you install a wider shelf.