Features: ---Round drill down base with a 1" rubber ball and AMPS hole pattern ---Standard size (medium) double socket arm - overall length: 3.73"; socket-to-socket length: 3" ---Round adapter base with a 1" ball - Includes stainless steel hardware that attaches directly to the bottom of the Garmin echo and Striker 4 Series (see compatibility chart below) ---Height is fully straight: 5" ---RAM ball & socket system - easily adjusts to your perfect viewing angle ---Constructed of high strength composite(mount) and marine-grade aluminum(adapter plate) ---Mounts horizontally or vertically ---Holds up to 2 lbs.