The largest ring is fairly easy to cut with one hand as shown in the listing pictures but small rings are almost impossible to open this way and in fact more difficult for me more open than the conventional split ring. They're nicely made and feel solid, but if you're looking for something that offers easy on/off functionality, you can get it from the largest size, but you definitely won't get it from the smaller ones. . Even with the large size, it's still quite difficult to fit something wide enough (like a car key). / off, they're good but probably overpriced. If you want a quick on/off script, I think the standard split rings and carabiners are better.
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