This ELAN shank button is a sew-on closure for garment repairs and new sewing projects where a raised back is preferred. Each card includes 4 button(s) measuring 10 mm (3/8 in), and the shank provides extra thread space for thicker plackets and layered fabrics. Sew through the shank with strong thread, knot securely, and check spacing before stitching for a smooth, secure closure that resists pulling.