The SM9RMSAMPS Robust phone mount 4-Hole AMPS drill base is designed for mounting to a flat surface, including car or truck dashboards or consoles as well as other solid flat surfaces. It holds phones 4.88 inches up to 7.18 inches tall and 2.37 inches to 3.94 inches wide, including Apple iPhone 12 Pro Max, iPhone 12 Pro, iPhone 12, iPhone 12 mini, iPhone 11 Pro Max, iPhone 11 Pro, iPhone 11, iPhone XS Max, iPhone XS, iPhone XR, iPhone X, Samsung Galaxy S21, S20, S10, and S9, Galaxy Note 20, Note 10, and Note 9, Google Nexus 6 and Nexus 5. (Mount your phone in the landscape position and rotate the holder for portrait viewing.) Use a Phillips screwdriver to set the phone holder’s height and width to your phone’s size specifications. The adjustable phone holder features a key lock (with 2 master keys included) that keeps the phone secure. The phone holder swivels for both portrait and landscape viewing, and the mount’s double-ball shaft arm provides additional adjustment for optimum viewing. Two 180° adjustment points at the top and bottom of the mount provide additional flexibility. The mount base attaches with screws (screws of two different lengths included). The 4-Hole AMPS pattern consists of four holes located in a rectangular pattern spaced at 30.17mm x 38.05mm (measured as the center-to-center distance between holes). This mount is solid and sturdy enough to be used in commercial and enterprise settings.