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I tried using these one a ring that was a bit large. These ring adjusters just never stayed in place. I even tried using super glue and it eventually fell off. I'm going back to the old fashioned metal ring resizer.
I read all the reviews for this, and I wish I had paid better attention to them. They fit really well on the rings, however there is nothing to keep them in place, and eventually they fall off. The one that I had on my ring fell off, and one of my grandkids found it and tried to put it in her mouth, which could be a choking hazard. So I'm headed to a jeweler to get it fixed the proper way instead.