ELAN shank-back buttons are sewing closures for coats, cardigans, dresses, and accessories where you want the button to sit slightly off the fabric. This card includes 2 buttons in 18 mm (3/4") that sew on through the rear shank, helping stitches stay behind the button face and giving room over thicker plackets. Match the diameter to existing buttonholes and stitch with strong thread; add a small backing button on heavy fabrics for extra support.