PF19.0W fits widescreen size desktop LCD monitors with a diagonally measured 18.95" viewable screen; actual filter dimensions are 10.05" high x 16.06" wide. This filter is designed for widescreen desktop LCD monitors with screens that appear more rectangular than square and have a 16:10 aspect ratio. Desktop monitor privacy filters keep confidential and private information private. 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. 3M"s PF19.0W Privacy Filter provides 1.5 times more effective privacy than competitive filters and offers more consistent quality and uniform appearance, thus reducing visual distractions.