Add a secure location for your large marine electronic device with this RAMA(R) Drill-Down Marine Mount. Flat surface drill-down mounting solution Marine-grade powder-coated aluminum Ball-and-socket for near-infinite adjustability Universal AMPS hole pattern for easy compatibility Short double socket arm 3.68" diam. round base with D 2.25" rubber ball 11" x 3" rectangle base with D 2.25" rubber ball For large marine electronics with an overall height of 8.125"