This ELAN sew-on shank button adds a clean closure to garments, knitwear, and small accessories where you want the stitching hidden on the back. The card includes 4 buttons sized 11 mm (3/8 in), suitable for repairs or matching closures on shirts, cardigans, cuffs, and light outerwear. Sew through the rear shank with strong thread and reinforce stress points; check buttonhole fit before stitching and protect the button from direct heat when pressing.