RAM Drill-Down Marine Electronic Mount (RAM-111U) (sku 54657)The RAM 111U consists of a medium double socket arm, 2. 5" diameter round base, and 6. 25" x 2" rectangle base. The round base includes a 1. 5" C size rubber ball and contains pre drilled holes, including the universal AMPS hole pattern. The rectangle base also includes a 1. 5" C size rubber ball and contains a variety of pre drilled holes that are compatible with several marine electronic devices, including fishfinders and chartplotters. PRODUCT