HI,
The adapter can work as a mounting point for sprockets BUT you will have to start with a hub initially designed to use Shimano's centerlock braking system.
If you do not have the center lock hub to start with you could simply bypass the extra pieces (the ones you were asking about....i.e. the adapter pieces) and cost and go straight to a ISO standard disc brake hub.
At that point you can take a standard sprocket and drill the appropriate holes for a direct to hub mount (doing this tho will place the sprocket where the disc rotor would have been....on the furthest outside portion of the hub......The direct mount method does not result in the best chain line but it can work). (As an aside, our Super Sprockets come predrilled for direct mount to an ISO standard disc brake hub).
To "fix" the chain line issue above AND to allow the use of a disc brake rotor (if the bike is to be used with a disc brake) a Top Hat Sprocket Adapter can be used.
Hope this helps you.
Andrew
Here is an interesting link regarding the center lock system VS ISO std disc hub mount :
Disc Brake Rotors: Shimano CenterLock or ISO 6-Bolt? - FeedTheHabit.com