The RAM-B-166-UN8U Universal X-Grip II Tablet Cradle Windshield Suction RAM Mount is a Marine Grade Aluminum Mount with a Locking Suction Cup Base and RAM Universal Cradle. The mount is designed with a RAM 1 inch diameter patented rubber ball and socket system that has adjustment point at the cradle and base. The 1.0 inch diameter B size ball and socket system give the mount an approximateholding weight of up to 5 lbs. With a twist of the arm knob, you can move the Universal X-Grip II Tablet Cradle mount to your optimum viewing position.