Fanatec wheels use a 52mm bolt pattern, many standard quick releases are 50mm. This adapter allows you to replace the Fanatec quick release with a standard automotive quick release.
You need to supply 6mm nuts which insert into the rear of the adapter. You then bolt the adapter onto the hub using 5mm counter sunk bolts. Your hub is now ready to bolt a 52mm wheel onto your hub assembly using 5mm bolts.