The HMHD006 headrest mounting pedestal can be used as a replacement, upgrade, or as an addition to an existing pedestal. It is compatible with Arkon's Dual-T universal phone and tablet holders (sold separately), including the Slim-Grip Ultra Universal Smartphone and Midsize Tablet Holder (SM060-2), Slim-Grip Universal Smartphone Holder (SM050-2), Slim-Grip Universal Tablet Holder (TAB001), Universal Tablet Push-Button Holder (TAB003), Mega Grip Universal Smartphone Holder (SM040-2), and Mini Grip Smartphone Holder (SM015-2SLM). This mount includes Arkon's Heavy-Duty Aluminum Mounting Pedestal with 8" Multi-Angle Arm and Headrest Clamp Base (Holders sold separately.). Arkon's headrest mounting pedestal is a road trip essential and is ideal for multiple passengers who want to view a smartphone or tablet in the center of the back seat. The mount features an 8-inch multi-angle arm that attaches to a headrest post on either the front or back seats. The mounting pedestal installs onto most headrest posts. This sturdy 8-inch mount features three adjustment knobs at 2.5 inch intervals on the mount arm for easy positioning. Two additional 180° adjustment points at the top and bottom of the mount provide additional flexibility in positioning the device.