The aluminum pedestal measures approximately 2.4 inches (61mm) end-to-end and attaches with included Allen wrench to straight bar headrest posts on either the front or back seats.
Arkon's HM00425MM car headrest mount pedestal is ideal for mounting a 25mm (1 inch) ball compatible device holder, pedestal, or adapter (not included) in the center of the back seat for use in taxis and other passenger vehicles.