RAM Mount Double Twist-Lock Suction Cup Mount w/Tab-Tite Universal Spring Loaded Cradle f/Apple iPad 1-4 w/or w/o Light Duty Case [RAM-B-189-TAB3U]Double Twist Lock Suction Cup Mount w Tab Tite Universal Spring Loaded Cradle f Apple iPad 1 4 with or without Light Duty Case The RAM B 189 TAB3U consists of a double 3. 3" twist lock suction cup base, double socket arm, round base adapter and Tab Tite universal clamping cradle. The suction cup base is designed to have a strong hold on glass and non porous plastic surfaces. The mount is designed with a RAM 1" diameter patented rubber ball and socket