This gas spring single monitor arm is compatible with 17-32 inch monitors. It allows you to effectively utilize the space under the monitor, giving you more desk space. It uses a gas spring mechanism for easy movement. You can freely adjust the monitor's position and set it to your preferred position. This is a single-arm type that can accommodate one monitor. It's a 5-axis articulating arm type with a wide range of motion. It supports monitors that comply with VESA standards (75mm x 75mm, 100mm x 100mm). You can choose from two installation methods: a clamp type that clamps to the desk's surface, and a grommet type that uses a bolt through a hole in the desk. Attach the screws to the back of the monitor and use the VESA mount on the arm to hook the screw part from below to secure the position. Once you've determined the monitor's viewing angle, tighten the screws on the joints firmly to secure it. Thank you for viewing.