RAM® Drill-Down Double Ball Mount for Humminbird Helix 5 - Medium 1.5" x 2.5" 5" diameter round base that

5" diameter round base that contains the universal AMPs hole pattern

This kit comes with a key lock knob that allows the user to lock the mount in one position

female octagon button at the other

5-inch balls

5" x 2" 4 hole pattern

RAM® Drill-Down Double Ball Mount for Humminbird Helix 5 - Medium 1.5" x 2.5" 5" diameter round base thatThe RAM 202 153 202U powder coated, marine grade aluminum Humminbird Helix 5 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" x 2. 5" rectangular plate with a 1. 5" C size ball and 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