3M Framed Desktop Monitor Privacy Filters offer outstanding privacy protection; allowing only those directly in front of the monitor to see on-screen data. Anti-reflective surface reduces screen glare. Fits 20" to 20.1" diagonally measured widescreen monitors. Actual filter viewing area dimensions are 17 11/16" wide x 10 15/16" high (450mm x 278mm). Two easy-to-use attachment methods - 3M Command adhesive and attachable hanger arms. Helps protect the display from scratches and fingerprints. Easy to clean surface is smudge-resistant and repels permanent marker.