The HUB-1600i-RM USB 16-Port Hub is designed for the use in industrial application under tough working environments. It is housed in a DIN-rail mountable metal case with screw holes for lockable USB and power cables. Next to each USB downstream port connector are two screw holes for lockable USB cables to add extra reliability of connection. The terminal power input connector is with two screw holes securely locking the power wires to prevent them from accidental disconnection. For more details on product, Please refer to http://www.papyrus.co.il/rack16usb20hubmetal.htm