Swing arm base, 2.25 in.
3 joints, with 2.25 in. ball (size D)
A RAM mount system always consists of a base, a compound and a device carrier. This base is a good start for your individual holder.
With the swing arm base you can bridge longer distances. It is intended primarily for mounting on the floor of the cabin, if there is not enough space for the mounting of a RAM system within reach.