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 21" to 22" diagonally measured LCD widescreen monitors and 21" diagonally measured CRT monitors. Actual filter viewing area dimensions are 19 1/8" wide x 12 1/8" high (485mm x 307mm). 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.