Wide Angle Lens for MagicShine, Gemini, and many other Bike Lights / Headlight. Includes O-Ring Changes the factory 10 degree spot to a 10 degree x 30 degree flood Wide angle lens spreads the beam out horizontally so light is not wasted in the sky were you don't need it Sized to fit the Magicshine MJ-808/808E/808U or Gemini Titan (39mm dia.) Also fits most Magicshine copies with included O-ring (The so called CREE LED Bike lights) NOTE: ONLY WORKS WITH SINGLE EMITTER LIGHTS Easily installed, Takes just seconds