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 Features: Complete flat surface, drill-down mounting solution with an overall height of 7.35 RAM® Mounts ball and socket technology allows for near-infinite adjustability Made of power-coated, marine-grade aluminum for durability and reliability in the most demanding marine environments Backed by a lifetime warranty Made of Powder-coated, marine-grade aluminum for durability and reliability in the most demanding marine environments