18.4" Anti-Glare Privacy Filter for Widescreen Desktop LCD Monitor ( Aspect Ratio 16:9) 409mm (W)x 231mm (H) Keeps your personal or confidential information safe from prying eyes. You'll see the information on your display while people on either side only see a darkened screen. Designed to fit widescreen desktop LCD monitors with a diagonally measured 18.4 viewing screen and a 16:9 aspect ratio. Actual filter dimensions are 409mm wide x 231mm high . Reversible, matte side reduces glare and reflections.