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, a RAM Hi-Torq Wrench, 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 various Humminbird models including the Helix 8, 9, 10, 12, 15, Solix 10, 12 15, and Apex 13 & 16. 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.
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3-Hole 120 Degree (Large), Rectangular Plate: 1.5" x 4.5", Round Plate: See Drawing