Size & Package: The package comes with 5 pcs of chain sewing buttons, available in multiple sizes (15mm/18mm/20mm/23mm/25mm/28mm) to choose from. Each button has a 3mm hole diameter, which is sufficient for daily garment repair, formal wear decoration or DIY craft projects needs. Material: The chain sewing buttons are made of metal borders paired with pearl or black gem centers. They feature fine workmanship, good gloss and smooth surfaces without burrs, which won't scratch clothes, are durable for long-term garment use and suitable for formal wear matching. Elegant Design: These buttons adopt a classic chain edge design, with two center styles (pearl and black gem) and two metal border colors (gold and silver). They exude a retro and sophisticated vibe, perfect for formal wear decoration and handmade garment enhancement, and color may vary slightly due to shooting angles and monitor differences. Easy to Use: Each chain sewing button has pre-drilled holes on the back, suitable for hand sewing for garments. You can easily thread and sew it onto fabric like wool coat or suit fabric, and it won't fall off easily after installation—no complicated tools required for DIY garment decoration. Widely Applicable: The buttons are perfect for sewing on outerwear like wool coats, suits, blazers and jackets, as well as formal wear to upgrade clothing style. They are also ideal for DIY projects like handmade garment decoration, craft making, card making and scrapbooking as practical garment accessories.