The Hole Size:about 4.5mm. Compatible with 3mm European Pandora charm bracelets and necklaces.DIY jewelry for Charms Bracelets, Key Chain or Pendant Necklaces.Pick the charms for mom, mother, wife, nana, grandma, grandmother, granddaughter, daughter, sister, aunt, auntie, best friend, friend for Mothers day.Birthday.Valentines day.Anniversary.Engagement.Graduation.Wedding.Friendship.Thanksgiving day.Christmas.Holiday.New Year.