Hammond 1551USB Series Miniature Plastic USB Enclosures – Hammond 1551USB1BK, The Hammond 1551USB1BK is a 35 x 20 x 15.5mm 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 35x20x15.5 Black