Ergotron 45-491-216 LX Dual Side-by-Side Arm - Mounting kit (desk clamp mount, pole, 2 articulating arms, 2 extension brackets, Position LCD screens for maximum ergonomic comfort with unparalleled range of motion - promotes wellness in any work area Free up your desktop to increase your workspace 13-inch height range meets the ergonomic needs of more than nine out of ten adults Extends/retracts LCDs up to 18", push your displays out of the way when not in use Open and view multiple applications and documents, eliminating the need to toggle between applications