Double socket arm mount with 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 7.35″ 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. Powder Coated Marine Grade Aluminum. C- size 1-1/2 inch ball system. Black Powder Coat. Shown with Garmin 250C fish finder, GARMIN UNIT NOT INCLUDED.