It is a panavise like, or third hand for electronic purpose.
But you can use it also to hold little parts for painting or to glue them.
It can move in any direction and can hold up to 140mm cards or objects.
Can not hold heavy parts.
There is a fast release system and you can adjust sides quickly by removing/replacing the T part in the middle.

You can fill the base with bolts, money or anything else to make stability better.
To prevent from moving when working on, you can adjust the ball movements with 3 bolts M4x20. Don't try to block them, it is not recommended.