This is a K&F CONCEPT PK-L/M mount adapter. - Brand: K&F CONCEPT - Model: PK-L/M - Type: Mount Adapter - Lens Side: Pentax K Mount - Body Side: Leica M Mount It's in good condition, as it's only been used a few times. Comes with the original box. I use a Sony camera, and I was using it with a double mount: Lens mount → M mount M mount → E mount By using an M mount in between, I could share my mount assets, increasing versatility. By the way, a new one seems to cost around 4,320 yen at Map Camera.