3M Privacy Filters keep confidential information private. Only persons directly in front of the monitor can see the image on screen; others on either side of them see a darkened screen. Designed to fit standard desktop LCD monitors with a diagonally measured 19" viewing screen and a 5:4 aspect ratio. Actual filter dimensions are 14 13/16" wide x 11 7/8" high (377 mm x 302 mm). Includes your choice of two easy-to-use attachment methods. Reversible- matte side reduces glare and reflections. Lightweight- thin- frameless design. Protects display from dirt- debris and scratches. Cleans easily with a soft cloth and water. Great for high traffic areas and open office environments.