I use these with all of the earring posts from Artbeads and find that they fit really well. They are comfortable to wear with all of the earring stud posts. I find them a bit expensive but worth every penny.
These are my personal favorites for earring backings. The are comfortable, secure, and easy to use. I give my customers a choice of these or the sterling heavy duty type circular backing.
Too loose on snap setting posts
I bought these to use with the sterling silver round snap setting earring posts sold on this website. I felt they were not tight enough on the post. I also bought the Extra Heavy earring backs and I felt those worked better/tighter. These may work fine with other posts, but I felt they were too loose on the snap setting posts.
I was posed a question concerning these little clutches and curiosity got the best of me. I was asked if these clutches contained rubber. I could not answer the question with any certainty, so I took one apart in order to answer the question completely. Yes, these clutches contain a tiny piece of rubber to help them hold tighter. It's not necessarily a bad thing, unless you happen to be allergic to rubber. The clutches seem to work well otherwise. Just be careful if you ever have the need to scrap them. I would hate for anyone to ruin an entire batch of scrap silver because of one tiny piece of rubber. Although I do feel the fact that they do contain rubber should be stated in the item description. Just my opinion.