Our Folding Side Shelf with Power Strip / USB attaches to our 16” 4-Drawer Rolling Tool Cart*. Built from sturdy steel, this unique shelf is powder-coated** to resist scratches better than standard paint. It fits securely in place when upright, and effortlessly folds down when not in use. Four multi-sized 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 come in three sizes: One 3 1/4-inch diameter, two 3-inch diameter, one 2 3/4-inch diameter. The built-in power strip surge protector includes three 3-prong outlets and 2 USB ports with a master power switch, and a 9ft power cord. Rated Voltage: 125V 50-60Hz, Max Output Power: 1875W. *This item has an installation bolt pattern that is compatible ONLY with  Viper Tool Storage products