The RAM-B-224-1U suction cup base consists of a 3.3" diameter RAM Twist-Lock suction cup connected to a RAM-B-238U diamond base with a 1" B size rubber ball. The RAM Twist-Lock suction cup base is a fan favorite for use on vehicle windshields, and provides an extra strong hold on any smooth, nonporous surface. Complete your mount by attaching a B size RAM double socket arm and device holder.