Ram Mounts Large Marine Electronics Mount - 11in x 3in Plate The Ram Mounts Large Marine Electronics Mount is a complete flat surface, drill-down mounting solution for large marine electronics with an overall height of 8.125in. Ram Mounts ball and socket technology allows for near-infinite adjustability. These mounts are made of power-coated, marine-grade aluminum for durability and reliability in the most demanding marine environments and are backed by a lifetime warranty. The Ram Mounts Large Marine Electronics Mount consists of a short double socket arm, 3.68" diameter round base, and 11" x 3" rectangle base. The round base includes a 2.25" D size rubber ball and contains pre-drilled holes, including the universal AMPS hole pattern. The rectangle base also includes a 2.25" D size rubber ball and contains a variety of pre-drilled holes that are compatible with several large marine electronic devices, including fishfinders and chartplotters. *The 11in x 3in rectangle base is a universal mounting bracket with a selection of mounting hole locations. In certain applications additional holes may need to be drilled for proper fit with your electronic device. Hardware included: (4) .312in x .187in shoulder washers; Overall Length: 8.125in; Top Plate: 3in x 11in; Bottom Plate: 3.68in Diameter; Ball Diameter: D (2.25in); Materials: Marine-grade Aluminum;