This is a protective cage for the Steadicam M-2 Volt.
It simply fits around the thumbwheels on the Steadicam M-2 Volt control block and protects the wheels. It is secured via the two existing threaded holes.
The two original 4-40 x 3/8" socket head (Allen) screws securing the block in place will need to be replaced with slightly longer 4-40 x 9/16" ones (not supplied).
For full details of all the various brackets available from 'delve', please go to the delve website HERE