Arkon's heavy-duty locking tablet seat rail or floor mount fits tablets with 7''-10'' screen size, including Samsung Galaxy Note 8.0, Galaxy Tab 3 7.0 and 8.0, Galaxy Tab Pro 8.4, Galaxy Note 10.1, Galaxy Tab A 8.0, Galaxy Tab E 8.0, Galaxy Tab 4, Galaxy Tab Pro 10.1, Galaxy Tab S 10.5, LG G Pad 7.0, 8.0, and 10.1, Nexus 7, 9, and 10, Apple iPad Air 2 and iPad Air, iPad 4, 3, and 2, iPad Pro 9.7. The car seat or floor mount is ideal for those who want a phone holder for the truck but prefer mounting it somewhere other than the windshield or dash. This mount includes Arkon's universal plastic locking tablet holder and 18'' flexible aluminum gooseneck floor mount with 25mm (1 inch) ball-compatible Robust Mount Shaft. The universal locking tablet holder features a key lock (keys included) that keeps the tablet securely in place. This sturdy locking tablet holder is made of plastic and can be adjusted horizontally and vertically, making it compatible with tablets as small as the G Pad 7.0, or as large as the Nexus 10. Use a Phillips screwdriver to adjust the tablet holder to your tablet's size specifications. Security hardware is also included. Install the mount's heavy-duty metal bracket to the car's seat rail with a socket wrench by loosening the passenger seat track bolt, inserting the seat track bolt bracket, and retightening the seat track bolt. Bend the 18'' gooseneck and adjust both of the mount's 25mm ball adjustment points for 360-degree rotation of the phone. Optional floor brackets are included for screwing the car dock directly into the floor of the vehicle. (Warning: Drilling into the vehicle's floor may damage the vehicle. Use caution and consult a mobile install professional to avoid drilling into any sensitive vehicle components.)