Double socket arm mount with mount with 1 inch diamter B size balls and two round bases for Garmin Fish finder. Both bases have the AMPS hole pattern and a custom hardware pack is included for assembly. Mount is 5″ tall at maximum extension and is collapsible. Rubber ball and socket feature dampens shock and vibration. For most applications, mount will support up to ten pounds. RAM universal ball and socket mount system. Marine grade aluminum with powder coat finish and rubber ball. Lifetime Warranty. FISHFINDER UNIT NOT INCLUDED.