This quick-release mount consists of a 2.5" diameter round base with the universal AMPS hole pattern, double socket arm, and adapter base that inserts directly to the back of Lowrance Elite-4 and Mark-4 Fishfinders. The adapter serves as a quick-release mechanism, allowing you to remove or transfer your Fishfinder in seconds. Designed into the mount is a 1" diameter patented rubber ball and socket system with adjustment points at both socket ends of the arm; this combined with RAM's rubber ball and socket technology, allows for almost infinite adjustment and perfect viewing angles. Powder-coated marine-grade aluminum construction. 1" rubber "B" ball size. Compatible Units: Lowrance Elite-4Lowrance Elite-4 DSILowrance Elite-4 GoldLowrance Elite-4xLowrance Elite-4x DSILowrance Elite-4mLowrance Mark-4 Powder-coated aluminum construction 1"" rubber ""B"" ball size | Lowrance RAM 1" Mark/Elite 4" Series Quick-Release Mount