Specifications: 3 size for you pick 1. Outside size: approx. 15*15mm Inside center bar: approx. 9 mm 2. Outside size: approx. 18*18mm Inside center bar: approx. 12 mm 3.Outside size: approx. 35*35mm Inside center bar: approx. 29 mm Conversion: 1 Inch=25.4mm It Perfect for decoration of wedding, hair bows, doll clothes, card, scrapbooks, gift box, etc Mainly used in DIY: clothes decorative buttons, hairpins, bracelets, bags and other decorative accessories