The diameter of the charm's hole is about: 4.5 to 5.0 mm. It is compatible with Pandora bracelets, U.S. bracelets, European bracelets, and most kinds of charms bracelets but Pandora Me. Nice gift for birthdays, Mother’s Day, Valentine's Day, Christmas, anniversaries, Memorial Day, New Year's Day, Easter, and your special days. Suitable for mom, mother, mum, wife, grandma, grandmother, auntie, aunt, best friends, family, and women.