Approximately 25mm overall. We are very excited to bring these vintage brass components to you. They came out of the E.A. Adams warehouse that closed many years ago. Designers like Miram Haskell used this type of component within their jewelry fashions. Please check out the vintage chatons we have found that fit these settings perfectly. You will have a lot of fun with these. We sure so. You can soak them in simple green to brighten the brass to whatever amount of patina you feel you would enjoy in your designs.