I have a very thin copper chain and my 18 gauge jump rings were too big to pull through so I bought these 21 gauge jump rings 10 gauge, to use with my chain. While I'm not able to accurately measure the wire gauge, they are narrower than my 18 gauge rings, so I have good reason to believe they are 21 gauge rings as per the product description. The finish is bright and shiny and matches my necklace and other copper beads and finds just right, so I'm happy with that. They are easy to work with either an adapter ring tool or (my preference) two pliers to open and close. (I also use a lighted magnifying glass,
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