Compatibility - Fits 13\" to 27\" monitors (weighing up to 17.6 lbs) with VESA 75x75mm or 100x100mm back side mounting. Please Note: Monitor mount must have 75x75mm VESA compatibility and the adapter is not compatible with monitors containing power and video ports in the center.VESA Height Adjustable Adapter - Attaches to your current mount or stand to give your monitor an increased 6.25” range of height adjustment (3.25” up and 3” down from center). Please Note: Hardware for monitors with curved or recessed backs is not included.Tool-less Adjustment - Allows you to adjust your monitor\'s height by hand in an instant without the use of tools.Protective Padding - Located between the adapter and your monitor, anti-skid protective padding increases stability and helps prevent scuffs and scratches.We\'ve Got You Covered - Sturdy steel design is backed with a 3 Year Manufacturer Warranty and friendly tech support to help with any questions or concerns.