RAM Mounts Drill-Down Double Ball Mount for Humminbird Helix 5

The RAM-202-153-B-202U consists of a round 2.5" diameter round base (Universal AMPs Hole Pattern), short double socket arm and 1.5" x 3" rectangular base. The rectangular base contains four holes with a center to center pattern of 1" x 2.5". For most applications, mount will support up to ten pounds.