This is a front ring used for the TG-5 to TG-7 cameras. It came as a bonus when I purchased camera parts, but I already have one and have no use for it, so I'm selling it. I believe it's a part for the TG-5, TG-6, or TG-7, but I couldn't confirm it just by looking at it. For reference, I've also uploaded photos of it attached to my TG-5 and TG-7.