This is a well-made heavy chrome and anodized black aluminum adapter with a strong spring lens release/lock button.
Leica M lenses as well as Leica screw-mount lenses (with the screw-to-bayonet adapter) will work on all the Sony NEX bodies and focus to infinity.
I really never used it and I no longer have my NEX system, so it's up for sale with the box.
This is made 'way better than the "cheapies" on eBay.
$49 postpaid and PayPal paid in CONUS.