SINGLE VESA MONITOR MOUNT: Fits one computer screen 19 20 21 22 23 24 25 26 27 28 29 30 inches, with a maximum support weight of 22 pounds, using the 75x75mm or 100x100mm VESA square bolt hole pattern found on the back of the monitors. Comes with C-clamp base mount for use on desktops 1 to 2 inches thick. FEATURES: Vertical monitor desk stand has a telescoping pole for height adjustment up to 17 inches tall, which ensures an ergonomic position that will help prevent neck and back pain. HEIGHT ADJUSTABLE: Desk mount monitor stand can tilt up or down 15 degrees, swivel a full 360 degrees around, and raise and/lower 11.5 inches from its shortest to tallest extension. PLEASE FIRMLY TIGHTEN BOTH BOLTS ON THE HEIGHT ADJUSTABLE POLE TO SECURE THE HEIGHT OF THE MONITOR. EASY INSTALLATION: VESA mount comes with all mounting hardware, tools, and instructions necessary for assembly. Entire installation can be done in a few minutes. PLEASE FIRMLY TIGHTEN THE KNOB ON THE TOP OF THE MON