Hammond 1551usb series miniature plastic usb enclosures hammond 1551usb3bk the hammond 1551usb3bk is a 63 x 30 x 155mm usb enclosure moulded in ul94 hb rated black abs it is ideally suited for housing a dongle or mounting a small printed circuit board that incorporates a usb connector hammond 1551usb3bk miniature plastic usb enclosure 65x30x155 black