The RAM Fish Finder Mount Humminbird is specifically designed to fit Humminbird Fish Finders. With a powder coated marine grade aluminum mount, consists of a short double socket arm mount, and round base with the universal AMPS hole pattern, this RAM Mount makes mounting easy. The unique rubber ball and socket technology dampens shock and vibration while offering high adjustibility to achieve the perfect viewing angle. Short overall arm length is 5.225", Medium overall arm length is 7.35". Features Unique Rubber Ball and Socket Technology Shock and Vibration Dampening Perfect Viewing Angle