Kantek LCD Protect Deluxe Anti-Glare Filter for 19 to 20 Inch Widescreen LCD Monitors (LCD20W) Before Choosing your screen, use measuring instructions in image to left to ensure you choose appropriately Fits both 19 and 20 Inch Widescreen LCD monitors. The actual filter measures 17.7" W x 11.8" H, and fits over the front of the entire monitor. (19" Widescreen monitors have a 19.0" viewable diagonal and the viewing area is 16 1/8" W x 10 1/16" H. 20" Widescreen monitors have a 20.1" viewable diagonal and the viewing area is 17 1/16" W x 10 11/16" H.) Reduces fatigue caused by display glare (not designed to filter out high direct glare from a light source shining directly on the monitor, such as a direct window) Improves image and enhances contrast; neutral light tint for true color fidelity Elegant frameless design protects the LCD display surface