3M Privacy PF500L Filters allow users to work in high traffic areas with confidence that private on screen information will remain confidential. Only persons directly in front of the computer screen can see on-screen data. Blacks out screen from a side view so on lookers see only a dark blank screen. Helps protect fragile LCD screens from scratches and fingerprints thus avoiding costly repairs/replacements. Reduces screen glare up to 95%. Fits 13-15" CRT desktop monitors. Reduces static and dust build-up when properly grounded.