- PF 21.3 fits standard desktop LCD monitors with a diagonally measured 21.3" viewable screen.- Actual filter dimensions are12.776" high x 17.028" wide.- This filter is designed for standard desktop LCD monitors with screens that appear more square than rectangular.- Great for high trafffic areas or open cubicle offices.- Privacy filters keep confidential and private information secure.- Utilizes 3M's microlouver privacy technology so only persons directly in front of the monitor can see the data on screen.- Passersby see only a dark, blank screen.- Never blurs or distorts on screen data.- Reversible for either glossy or matte screen finish.- Reduces reflections when used with the matte side facing you.- Helps protect fragile LCD screens from scratches and fingerprints.- New easy on easy off attachment system.- Easy to attach and remove.