Marine Grade Aluminum Lap Top Floor Mount. This mount connects directly to then floor, or any mounting surface with the 2.5" diameter base which is at 90, 45 or 0 degrees to the 6" long vertical pole. At the top of the pole is a 1.5" ball attached to the socket of a standard 4 5/8" 1.5" double socket arm. The LapTop tray (NOT included) connects to a 6.25" x 2" Plate with 1.5" ball that joins to the double socket arm. Lap Top Tray (RAM-234-1) IS NOT included with the mount. Mounting hardware for the base is not included. The base unscrews from the pole, allowing the mount to be moved to other locations.