- PF20.1 fits standard size LCD desktop monitors with a diagonally measured 20.1" viewable screen.- Actual filter dimensions are 16.12" high x 12.1" wide.- This filter is designed for desktop monitors with screens that appear more square than rectangular and have a 4 x 3 aspect ratio.- Helps keep confidential and private information safe in open cubicle offices.- Utilizes 3M's microlouver privacy technology so only persons directly in front of the monitor can see the image on screen.- Passersby see only a dark screen.- Excellent for high traffic areas.- Reversible for either glossy or matte screen finish.- Reduces reflections when used with the matte side facing you.- Helps to protect your LCD panel from scratches and abrasions.- Easy on easy off attachment system.