The RAP-101U-LO11 consists of a 2.5″ diameter round base that contains the universal AMPS hole pattern double socket arm and adapter base that inserts directly to the back of Lowrance Elite-5 and Mark-5 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 1.5″ diameter patented rubber ball and socket system with adjustment points at both socket ends of the arm; this with RAM’s rubber ball and socket technology allows for almost infinite adjustment and perfect viewing angles. Compatible Devices: Lowrance Elite-5 Lowrance Elite-5 DSI Lowrance Elite-5 DSI Gold Lowrance Elite-5 Gold Lowrance Elite-5x Lowrance Elite-5x DSI Lowrance Elite-5m Lowrance Elite-5m Baja Lowrance Elite-5m Gold Lowrance Mark-5x Lowrance Mark-5x DSI Lowrance Mark-5x DSI Portable Lowrance Mark-5x ProMaterial: High Strength Composite & Powder Coated Marine Grade AluminumBall Size: 1.5″ Rubber Ball Size Note: The „U” in the part number reflects product packaged in poly bag. RAM recommends this mount for „Rugged Use” mounting applications, including heavy weight Lowrance Elite and Mark Fishfinders.