PF23.6W9 fits widescreen Monitor computers with a diagonally measured 23.6" viewable screen; actual filter dimensions are 11.56" high x 20.64" wide. This filter is designed for widescreen monitors with screens that appear more rectangular than square and have a 16:9 aspect ratio. Monitor privacy filters keeps 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.