The combo Side or Deck Mount 241 mounts to a flat surface or the side of a gunnel or transom. Fits all Scotty post mount rod holders. Fiber-reinforced, engineering-grade nylon construction for tough-as-nails performance. Easily swap your rod holders, fish finder mount, GPS mount or other Scotty fishing accessories from boat to boat! Overall dimensions are 4" x 2" x 2". The bolting dimensions are 1 5/16" x 3 3/16".