Hammond 1551usb series miniature plastic usb enclosures hammond 1551usb1bk the hammond 1551usb1bk is a 35 x 20 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 1551usb1bk miniature plastic usb enclosure 35x20x155 black