Ram Mount Suction Cup Twist Lock Base 3.3 Inch W/1 Inch Ball. The suction cup is designed to have an extra strong hold on any smooth non-porous surface, but for best result, mount the suction cup on a glass or non-porous plastic surface.
The RAM-B-224-1U consists of a 3.3 inch twist lock suction cup base that is connected to the (RAM-B-238U), diamond base with 1 inch rubber ball.