CTA Digital's Universal Security Holder with an intuitive counterbalance monitor arm offers an economical, locking solution for home offices, work, conference rooms, gyms, and any place that needs a durable tablet mount with lots of angle adjustment. With pre-drilled grommets, the monitor arm can be permanently affixed to tables or countertops up to 3.3-inches thick. A flexible hinge allows for tilting and 360-degree rotation. Arm positions are easily adjusted via the included Allen keys. To properly balance the arm with monitor mounted, firmly hold the arm horizontally, adjust the tension with the Allen key, reposition and retighten the arm. The holder grips diagonal corners snugly in place with rubber grips. To insert a tablet, unlock the arms with the included key, adjust to fit, then lock in place. The Universal Locking Security Holder is compatible with iPad 7th/ 8th/ 9th Gen 10.2”; iPad Pro 1st, 2nd, 3rd, 4th, & 5th Gen; iPad Air 3 & 4; iPad Mini 6; Samsung Galaxy Tab S7, S7+, S6 Lite, A7, A7 Lite, A8, 10.1”, Surface Go 1, 2; P11 Pro, Smart Tab M8, and other 8”-12.5” tablets.