Arkon’s XLRM8825AL RoadVise XL heavy-duty universal car seat rail or floor mount fits devices with cases weighing up to 2 pounds and measuring up to 5 inches wide, including Apple iPhone 11 Pro Max, iPhone 11 Pro, iPhone 11, iPhone XS Max, iPhone XS, and iPhone XR, iPhone X, iPhone 8 Plus, Samsung Galaxy Note 20 Ultra, Note 20, Note 10, and Note 9, Galaxy S20+, S20, S10, and S9, LG G7, G6, and G5, Nexus 6, and Nexus 5. It also holds 7-8 inch screen size tablets measuring up to 5 inches wide, including the Samsung Galaxy Tab 4 7.0 and 8.0, Galaxy Tab 3 7.0 and 8.0, Galaxy Tab A 8.0, Galaxy Tab E 8.0, Galaxy Tab S 8.4, and Nexus 7. This mount is not recommended for phones or other devices without a case measuring 2.64 inches wide or less, including iPhone 8 or iPhone 7. Gaming systems, including Nintendo Switch and Sony PSP are compatible with this holder. This mount includes Arkon’s RoadVise XL universal phone holder and an 18” heavy-duty flexible aluminum gooseneck seat rail or floor mount with 25mm (1 inch) double ball-compatible Robust Mount Shaft Arm. Arkon recommends using the RoadVise XL Holder with skins and ruggedized cases. The low-profile holder keeps rear smartphone and tablet cameras unobstructed. The car seat rail or floor mount is ideal for those who need easy access to their devices but prefer mounting them somewhere other than the windshield or dash. Loosen the passenger seat track bolt with a socket wrench, insert the included seat track bolt bracket, and then retighten the bolt. Bend the 18” gooseneck and adjust both of the mount’s 25mm ball adjustment points for 360 degree rotation of the device. Optional floor brackets are included for installing the mount 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.).