The RAM adapter base includes a 1" diameter rubber ball and 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. Compatible Devices: Lowrance Elite-5 Lowrance Elite-5 DSI Lowrance Elite-5 Gold Lowrance Elite-5x Lowrance Elite-5x DSI Lowrance Elite-5m Lowrance Elite-5m Gold Lowrance Mark-5x Lowrance Mark-5x DSI Lowrance Mark-5x DSI PortableLowrance Mark-5x Pro