This is a helicoid mount adapter from SHOTEN (焦点工房) that allows you to mount Leica M-mount lenses on Nikon Z-mount camera bodies. Brass parts are used on both the lens and camera body mount surfaces, increasing durability and mounting accuracy. The LM-NZ M (EX) has an extension of 8mm, significantly reducing the minimum focusing distance, allowing for close-up shots with Leica M-mount lenses. Used only once. I am selling this because I purchased a Voigtlander VM-Z Close Focus Adapter and no longer need it. *Please refrain from price negotiations. *Instant purchase without comments is welcome. Thank you.