ELAN shank-back buttons in 12mm (½ in) provide clearance over thick fabric layers and help reduce abrasion at the buttonhole. Each card includes 3 button(s). The integrated shank lets garments drape cleanly and makes fastening smoother on coats, cardigans, bags and structured pieces. Hand-sew with strong thread or heavy-duty polyester for a secure hold. Match button size to the finished buttonhole and reinforce stress points to extend wear.