LovelyJewelry Graduation Magic Book Student Cap Book Charm Beads For Bracelet The Hole Size is about 4.8mm~5mm, compatible with European bracelets. 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: Alloy Find a special gift for a loved one or a beautiful piece that complements your personal style from LovelyJewelry. If you have any additional questions or concerns, please feel free to contact us again and we will be happy to assist you further.