After losing the original ring around the GoPro Lens, this lens hood was created to provide a hood for the lens as well as protection for the fragile glass. Since I never use the camera in a case, this was the lightest way to protect the camera lens. Plus it creates some amazing footage! (pictures show battle scars from being ejected at high speeds from a moving RC aircraft) Note: installing may require some sanding and filing on the inside of the ring. It is meant to be a snug fit over the prongs that used to hold the old ring in place. No adhesive is required to keep it in place. Just be careful not to snap the lens housing during installation.