Complete flat surface, drill-down mounting solution for the Humminbird Helix 8, 9, 10, & the Solix 10; RAM Mounts ball and socket technology allows for near-infinite adjustability Includes 3.68" round base with D size 2.25" rubber ball, short length D size double socket arm, and a 1.5" x 4.5" rectangle base with D size 2.25" rubber ball that connects to your Humminbird Helix marine electronic Made of power-coated, marine-grade aluminum for durability and reliability in the most demanding marine environments Backed by a lifetime warranty Compatible with the Humminbird Helix 8, 9, 10, & the Solix 10 This powder-coated, marine-grade aluminum Humminbird mount consists of a short length double socket arm, a 3.68" diameter round base with a 2.25" D size ball, and one 1.5" x 4.5" rectangular plate with a 2.25" D size ball. The round plate contains two mounting holes at 180-degrees and three mounting holes at 120-degrees. The 1.5" x 4.5" rectangular plate contains a 4-hole pattern compatible with Humminbird 8, 9 & 10 models. The 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.