There is version which goes straigt to boat rail, then there is also wall mount version and next level racing sim rig version.
Boat version hole is 25mm diameter. Next level racing version hole is 36mm diameter.
If you print this boat version you need also 2x m3 nuts and 2x m3 25mm bolts.
Wall mount needs 2x screw.
Blackstorm rig holder needs 2x m3 35mm bolts and 2x m3 nuts.
The author marked this model as their own original creation.