CTA Digital Heavy-Duty Arm Mount with Lock for 7-10" Tablets PAD-HDM Aluminum alloy and metal frame for strength and durability with C-clamp or grommet installation Spring calibration system to help manage weight shifting 6 pivot points provide a wide variety of direction, height, angle and orientation options Key lock on the mount for safety and security Compatible with most 7  10 inch tablets, such as iPad Air 2, iPad mini and Nexus 9