The TAB192L23 car or truck seat tablet rail mount fits tablets with 7''-18.4'' screen size, including Samsung Galaxy Tab A 8.0, Galaxy Tab E 8.0, Galaxy Tab 3 7.0 and 8.0, Galaxy Tab Pro 8.4, Galaxy Note 10.1, 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, Verizon Ellipsis 8, Lenovo Tab, Apple iPad Air 2 and iPad Air, iPad 4, 3, and 2, and iPad Pro. The Slim-Grip universal tablet holder fits tablets 7 to 18.4 inches in screen size. The holder features a spring-loaded tension grip design that makes it easy to insert or remove the tablet by pushing down on the lower legs of the holder with one hand. Included with the holder are 10 support legs (4 short, 2 medium and 4 long versions). Choose the 4 legs that provide the best fit for your tablet. These insert at the top and bottom of the holder and can be adjusted in order to keep any side buttons and ports unobstructed. For most large tablets, the best mount holder configuration is to attach 2 short support legs on top and the 2 long support legs on the bottom of the holder. For vertical viewing, adjust the 360-degree swivel. The car seat rail mount is made of strong yet flexible aluminum, and is ideal for service vehicles, trucks, or those who need easy access to their devices but prefer mounting them somewhere other than the windshield or dashboard. Use a socket wrench to install the mount to the car's seat rail. Loosen the passenger seat track bolt, insert one of the included seat track bolt brackets, and then retighten the bolt. The seat bolt bracket openings measure 12mm wide and 30mm long. Bend the 23'' gooseneck and rotate the swivel ball adapter head for 360-degree rotation for exact positioning of the tablet.