The RAM Fish Finder Mount consists of a double socket arm in multiple lengths to fit your needs. The round base contains pre-drilled holes to allow for easy mounting, including the universal AMPS hole pattern. The rectangle base also includes pre-drilled holes that are compatible with several marine electronic devices, including fishfinders and chartplotters. Features Complete Flat Surface, drill-down mounting solution RAM Mounts Ball and Socket technology allows for near-infinite adjustability Made of powder-coated, marine-grade aluminum for durability and reliability in the most demanding marine environments. Backed by a lifetime warranty.Rectangle Plate Size: 6.25" x 2"