Hammond 1551USB Series Miniature Plastic USB Enclosures – Hammond 1551USB3TSK, The Hammond 1551USB3TSK is a 63 x 30 x 15.5mm 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 1551USB3TSK Miniature Plastic USB Enclosure 65x30x15.5 Transparent Smoke