Manufacturer Description The RAM-111-D RAM Mount Marine Grade Aluminum Mount, with Long Arm and Screw Down Base, consists of the 1.5 inch diameter ball and socket system with RAM Universal Rectangular 6.25 x 2 inch Plate. This mount is designed to be a universal mounting solution for large and heavy electronic devices, including Marine GPS, CB Radios, Ham Radios and more. The hole pattern found on the rectangular plate will connect to a large variety of third party cradle, gimbal brackets and mounts.