This ELAN shank-back button is a sew-on closure that sits slightly off the fabric to give clearance on layered plackets and thicker knits. Sized at 13 mm (1/2 in) with 4 per card, it suits coats, cardigans, uniforms, costumes, and bag closures, and it is easy to match to existing buttonholes during repairs. Sew through the rear loop with strong thread, secure on the wrong side, and test the buttonhole before stitching for a clean drape.