The RAM-D-111U consists of a medium 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. Included are four shoulder washers that allow smaller hardware to fit properly in the large holes of this plate.