Designed for a variety of electronic devices, including marine GPS/sonar, CB radios and ham radios, gimbal brackets, and more. The ball and socket system system features a 6.25" x 2" rectangular plate with different combinations of pre-drilled holes to securely seat your device, and a round 2.5" diameter flat surface base. The rubber ball and socket technology dampens shock and vibration while also providing near-infinite adjustability to achieve a perfect viewing angle. Ball 1-1/2"