Hammond 1551USB Series Miniature Plastic USB Enclosures – Hammond 1551USB3BK, The Hammond 1551USB3BK is a 63 x 30 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 1551USB3BK Miniature Plastic USB Enclosure 65x30x15.5 Black