3M Anti-Glare Filters help reduce mirror-like reflections from indoor bright lights to help keep what's on your laptop or monitor clear and visible. 3M Anti-Glare Filters diffuse light to reduce glare, are easy to apply, remove, and re-attach numerous times as needed with no lamination or bubbles and are compatible with most touchscreen displays. Diagonal Monitor Size: 21.5"; Fits Device Type: Flat Panel Monitor; Frame Type: Frameless; Mounting Details: Attachment Strips; Slide Mounts.