This is the Sanwa Supply "iPad/Tablet Car Headrest Arm (for rear seats, compatible with 7-11 inch devices)". The product number is 200-CAR044. It's an arm type with 3 joints, allowing for adjustment in both vertical and horizontal directions. I installed it on the passenger seat headrest arm, but I rarely used it and have been storing it at home. The instruction manual, box, and hex wrench are not included. The hex wrench is used for the bolts when fixing it to the armrest. Size 3 fits. Tablet Compatibility: Devices with a width of 191-272mm, height of 110-190mm, and thickness of 5-18mm. *Some devices may not be compatible even within the supported size range. Headrest Compatibility: Poles with a diameter of 8-15mm.