Space Saver Contour Shelving units are constructed of heavy-duty steel and protected by a powder coat finish. The top shelf is 13 1/2" D, middle and bottom shelves are 16" D. A 3" reinforced lip on each shelf prevents items from falling off. 18-gauge shelves are perforated on 2" centers to accept dividers. Additional 16"D shelves can be added. These 44" high units are available with back plates to keep items from falling behind unit.