... ", 18", 21", 24", 30", 36", 42", 48", 54", 60", 72" Shelf Ledge,For Solid and Wire Shelves Keep stored materials from falling ... , ledges can be installed on the shelf edges. In many cases a one-inch ledge will serve the purpose while allowing full ... access to the shelf from all sides. When a higher ledge is needed, the four-inch size can ...