Made in surgical stainless steel - not in cheap chromed lead metal.
Once you get the hang of it...no more pinching, and endless screwing. And no worries, the magnet is damn strong, so once it's in place, it's not going anywhere.
No more keys, Takes 5 seconds to get in and out, stackable .
And for a perfect match try Ze NUT Cockring and Ze NUT glans ring...