Hammond 1551usb series miniature plastic usb enclosures hammond 1551usb2tsk the hammond 1551usb2tsk is a 50 x 25 x 155mm usb enclosure moulded in ul94 hb rated transparent smoke abs it is ideally suited for housing a dongle or mounting a small printed circuit board that incorporates a usb connector hammond 1551usb2tsk miniature plastic usb enclosure 50x25x155 transparent smoke