Arkon's RMHM4AMPS car headrest mount is part of Arkon's Robust Mount Series. The metal 4-Hole AMPS head is ideal for securely mounting an AMPS-compatible device in the front or back seat for use in taxis and other passenger vehicles. Security hardware is included in order to make the mount theft deterrent. The multi-angle aluminum mount pedestal measures 6 inches end-to-end and attaches to straight bar headrest posts on either the front or back seats. Two 180° adjustment points at the top and bottom of the mount help position the device for perfect viewing. The mount is compatible with Arkon's Slim-Grip Universal Tablet Holder (TAB001-AMPS), Universal Metal Locking Tablet Holder (TAB004KL), and Universal Plastic Locking Tablet Holder (TAB005KL), as well as other device holders having a 4-Hole AMPS pattern (sold separately). This mount also works with AMPS-compatible vehicle-specific mounts (VSMs), cameras, GPS devices, audio/video receivers, or satellite radios including Sirius S50, Sirius XM Onyx Plus, XM Onyx EZ, Sirius XM Lynx, Stratus 7, Dock & Play, and Sirius Dock & Play (sold separately).