This is a mount adapter for attaching Nikon F-mount lenses to Fujifilm X-mount cameras. It's made of metal and feels heavy. I mostly left it attached, so there's not much wear and tear. I was able to mount Ai Nikkor and Ais Nikkor lenses. I've included a photo of it mounted on a camera. The original box and the included pouch are also included. Bulk purchases are also welcome! Please feel free to contact me with any questions.