This case is specifically for the Commodore 64/128 1541 Ultimate II cartridge tape adapter created and sold by Gideon (http://www.1541ultimate.net/).
Coming to you as a two piece case, it is secured from the bottom, threading into 2M heatsets melted into the lid.
Please take note that this case is for the VERSION III release of the tape adapter. There were two prior versions of the tape adapter that have a different configuration, and are not compatible with this case.
This case fits boards that look like that shown above in the photos. Please note that this is for the case only. The board is shown for illustrative purposes only.