RAM 3.25″ Diameter Suction Cup Twist Lock Base with 1″ Ball Part #: RAM-B-224-1UThe RAM-B-224-1U consists of a 3.25″ twist lock suction cup base that is connected to the diamond base with 1″ rubber 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. 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.