This is an adapter for attaching Leica M-mount lenses to SIGMA fp and Leica L-mount bodies. It is a reliable, made-in-Japan product by Rayqual. The machining accuracy is high, allowing for a secure fit without any play on both the camera and lens sides. A light baffle is installed inside to prevent internal reflections by covering the gold-colored electronic contacts, which are prone to reflecting light. I have confirmed that it can be attached, but it is essentially a new, unused item.