One holder is for a subminiature Minox C camera only. Compared to the official Minox accessory the camera is held inverted (because I keep my camera on a lanyard and I prefer to leave the lanyard attached when possible).

The second holder will accommdate a model B or a model C, but without a lanyard. If you have ever dropped a minox (I have), or even worry about dropping that little bar of soap shaped thing you might not be comfortable with that.

The model has a 5mm hole in the base for the user to tap ¼-20.

And finally, the third holder is for the minox LX. The LX is threaded ¼-20 and does not need a tripod adapter but the justification for this holder is the provision for a cable release.