Anti-Glare Filter reduces glare and mirrorlike reflections, making your screen easier to use in high-glare situations. It can also protect your screen against scratches. Use filter on 21.5" wide-screen 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 (477mm x 268mm). Lightweight, thin, frameless design is easily applied and reapplied numerous times with no bubbles. It attaches with optically clear adhesive strips. Easy-to-clean filter is compatible with most touch-screen displays and includes a cleaning cloth.