Two versions are included, a “Simple” one which is simply the case and a “Mounted” one which allows to.. mount the Pi on something using taper 3x6 screws (I used wood screws to mount it to the side of my Lack enclosure).
The “Simple” version is the green one on the pictures, the orange one is the mounted version.
The mounted version is designed so that it sits firmly when installed, but is also removeable.
Also check out @LUC4R4T0R's initial remix which predates my one.
The author remixed this model.
I changed my original model to fit the Pimoroni NVMe base.