Cleaning out my junk drawer this afternoon. I ran across these two ring extensions. I don't have a clue what they go to where I got them or even how long I've had them. The only markings on the side of both of them is what looks like a 1S6V or turn it around and it says Possibly V9SI. I have no clue what that is or what it refers to. If you recognize it and you want them, give me a reply and I will send it to you free.