The RAM-202-24-202U powder-coated, marine-grade aluminum Humminbird Helix 7 mount consists of a medium length double socket arm, a 2.5" diameter round base with a 1.5" C size ball, and one 1.5" x 3.5" rectangular plate with a 1.5" C size ball. The 1.5" x 3.5" rectangular plate contains a 4-hole pattern. Rubber ball and socket technology provides shock and vibration damping, and allows for near-infinite adjustability so you can position your device at the perfect viewing angle. Compatible with the Humminbird Helix 7.