OkiView Privacy Filter for Widescreen Desktop LCD Monitor 21.5" (PF21.5W9) (PF21.5W) Keeps your personal or confidential information safe from prying eyes Designed to fit widescreen desktop LCD monitors with a diagonally measured 21 9/16" viewing screen and a 16:9 aspect ratio Actual filter dimensions are 18 3/4" wide x 10 9/16" high (477 mm x 268 mm) Includes your choice of two easy-to-use attachment methods Reversible, matte side reduces glare and reflections