Does not include unit mount.
Notice to drivers in California and Minnesota: State law prohibits drivers in California and Minnesota from using suction mounts on their windshields while operating motor vehicles. Other Garmin dashboard or friction mounting options should be used. Garmin does not take any responsibility for any fines, penalties, or damages that may be incurred as a result of disregarding this notice. (See California Vehicle Code Section 26708(a); Minnesota Statutes 2005, Section 169.71)
This size of the ball is specific to the Garmin mounts for the Area 500, Nuvi, and Street Pilots GPS's.
The diameter of this suction cup is approximately 2-3/16".
Both this unit and the single Ram suction have the roughly the same hold strength. To add strength, you would need the Ram double suction mount.