Features: ---Round 2.5" diameter composite base with 1" ball and universal AMPS hole pattern ---Double socket composite arm - socket to socket length: 3" ---Quick Release Adapter with 1" Rubber Ball - base inserts directly to the back of Lowrance Elite-4 and Mark-4 Fishfinders ---RAM ball and socket system - easy adjustment points for your best viewing angles ---Constructed of high strength composite (base and socket arm) & marine grade aluminum (Quick Release Adapter) ---Genuine RAM Mount: Part # RAP-B-101U-LO11 ---Manufacturer's lifetime warranty ---Made in the USA Compatible Devices: ---Lowrance Elite-4 ---Lowrance Elite-4 DSI ---Lowrance Elite-4 Gold ---Lowrance Elite-4x ---Lowrance Elite-4x DSI ---Lowrance Elite-4m ---Lowrance Mark-4.