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 21 516 viewing screen and a 43 aspect ratio actual filter dimensions are 17 wide x 12 34 high 433 mm x 325 mm includes your choice of two easy to use attachment methods reversible matte side reduces glare and reflections lightwe