This eyecup is specially designed for golf rangefinders to give better stabilization during use for accurate distance measuring with less shake. It allows better viewing when the rangefinder is held to the eye and provides better protection for your viewfinder lens. It gives better precise distance measuring with a better stabilizing of shaking movement while in use. Blocks stray light from entering the viewfinder Protects viewfinder lens from impact and scratches effectively. This eyecups comes in 3 different stretchable fit sizes with a storage pouch.