Aluminum 1" Ball Double Ball MountHeavy Duty The 1 inches double ball mount is a heavy duty multi angle drill base pedestal mounting solution for tablets, cell phones, fish finder and more. It is designed to install directly on a table, cart, desk, in a vehicle, boat, or on any flat surface. Universal Design Includes two round ball bases and B size 3. 5" length double socket arm; The ball and socket technology allows for near infinite adjustability. Features 1 inch 25mm B Size Ball