Hammond 1551usb series miniature plastic usb enclosures hammond 1551usb3trd the hammond 1551usb3trd is a 63 x 30 x 155mm usb enclosure moulded in ul94 hb rated transparent red abs it is ideally suited for housing a dongle or mounting a small printed circuit board that incorporates a usb connector hammond 1551usb3trd miniature plastic usb enclosure 65x30x155 transparent red