For my application and had I been able to secure the arm, the main beam could have been 11"

Unit advertised as, "GPS Car Mount Cup Holder with Adjustable Arm for Garmin," may be appropriate for smaller units; however, when I mounted m Garmin 760 RV GPS unit, placed it in the cup holder, and let go, the mount fell over; because, of the size of the

I gave this mount four stars due to the fact that when the adjustable arm is fully extended it becomes somewhat unsteady and allows the navigator to vibrate in response to road conditions.

The arm is very sturdy and is very adjustable.

The articulated arm lets you put an attached device in any position and has a maximum straight-up height of 8.5 in