Hammond 1551usb series miniature plastic usb enclosures hammond 1551usb2bk the hammond 1551usb2bk is a 50 x 25 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 1551usb2bk miniature plastic usb enclosure 50x25x155 black