CharmsStory Sterling Silver Puzzle Autism Jigsaw Charms Monster Antique Finish Beads For Bracelets The Hole Size is about 4.8mm~5mm, compatible with European bracelets. As an special gift for daughters, mothers, wifes, and lovers. Ideal Gifts for Christmas, Mother's Day, Valentine's Day, Graduation Gifts, Bridal Gifts or your other special occasion you would like to make memorable. Metal: 925 Sterling Silver if you have any question, please be free to contact us !