The adapter allows you to connect two Manfrotto / Avenger / Matthews / Impact Super Clamps at a 90-degree angle to each other.

The Manfrotto 061RA Joining Stud adapter allows you to connect two Manfrotto / Avenger / Matthews / Impact Super Clamps together. The stud adapter is hexagonal, which allows the clamps to be attached at six different angles (45 degree intervals) to each other.
The advantage of this part is that the clamps can be quickly connected to each other and removed quickly, and it can rotate freely and change position.