yes they have very small openings. this is exactly what i was looking for. They don't fit most of my earrings but there are a few with very thin wires and these are the only backs that will fit. everything else is too big. I have a plastic container with backs for all kinds of shapes and sizes of earrings because there are many different sizes of wire that you get with different earrings. now I'm ready for anything. I love her. not that difficult to put on. Just feel what you are doing. I'm old and I can't see well either. I'm really glad I found her.
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