PF27.0W9 fits widescreen size desktop LCD monitors with a diagonally measured 27' viewable screen Actual filter dimensions are 13 1/4' high x 27 1/16' This filter is designed for widescreen LCD monitors that appear more rectangular than square have a 16:9 aspect ratio Utilizes 3M's microlouver privacy technology so only persons directly in front of the monitor can see the image on screen Reversible for either glossy or matte screen finish Protects fragile LCD screens from scratches and abrasions