This Folding Side Shelf with Power Strip / USB by Viper Tool Storage® attaches to our 16” 4-Drawer Rolling Tool Cart (Model V1804BLR, sold separately). Built from sturdy steel, this unique shelf is powder-coated to resist scratches and other typical wear and tear better than standard paint. It fits securely in place when upright, and effortlessly folds down when not in use. Four slots hold removable aluminum cups. A small 15 x 4-inch inset area helps keep small items from rolling off. Four 4-1/4-inch-deep aluminum cups provide extra storage. The built-in power strip includes four 3-prong outlets and 2 USB ports with a master power switch, and a 6ft power cord. Rated Voltage: 125V 50-60Hz, Max Output Power: 1875W. Overall dimensions: 10-1/2 inches wide x 18 inches deep x 5-15/16 inches high.