PF21.5W fits widescreen size desktop LCD monitors with a diagonally measured 21.5" viewable screen - Actual filter dimensions are 10 9/16" high x 17 3/4" - Reduces glare when used with the matte side - Passersby see only a dark screen making this filter excellent for high traffic areas - Choice of two easy-on, easy-off attachments - Easy to clean - Proudly made in the USA - One year warranty from date of purchase