The RAM-B-189B-202U consists of double 3.3" twist lock suction cup bases that is connected to a powdercoated metal plate and a B size 1" ball is included. 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.
Material: High Strength Composite and Powder Coated Marine Grade Aluminum
Ball Size: 1" Rubber Ball "B" Size
Note: The "U" in the part number reflects product packaged in poly bag.