This is a 52mm SKYLIGHT lens filter, which I used regularly with film cameras to protect the lens and to cut ultraviolet light in bright, sunny conditions, preventing a bluish cast. Although "SKYLIGHT" is an old-fashioned name, it can of course be used without any problems on lenses for digital cameras. As far as I can see, both the glass surface and the frame are in good condition for a used item, but please check the photos to confirm and assess the condition. It will be sent in a Kenko universal filter case.