I was a bit worried they would come loose when using the fob but they didn't. They come loose a little every now and then, but it takes about 20 turns to fully unscrew them, so this is never a problem. I thought I might need to put some light threadlock on them but I never did, they work well anyway. Durability has been good so far and feels much better than a traditional keychain in my pocket and when adding/removing keys. A pack of 20 is good as I have found them useful for other things around the house as well.
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