The SureFire F26 Red Tipoff Filter is a flip-up red filter that is dedicated to flashlights with a 1.25" bezel. The smooth focused red beam produced by your SureFire flashlight with the F26 will not degrade or impair your night vision viewing abilities. Outdoor enthusiasts often employ red-light flashlights to avoid disturbing game during twilight hours. This filter also comes in handy for non-tactical applications such as nighttime map-reading, and those predawn raids on the refrigerator.