The adapter was originally designed for the Voron V0.2 Mini Stealthburner toolhead, but the added kidney slots should allow you to mount it on other toolheads as well.
There are two versions of the adapter: one utilizes 2x M3x5x4heatset inserts for M3x6 screws, and the other lets you self tap the holes just with the screws.
When mounting the adapter on voron V0.2 use 2x M3x45 screws that came with the PCB and then use M3x6 screws to attach the PIS PCB to the adapter.
The author marked this model as their own original creation.