ELAN two-hole sew-through button measuring 20 mm (3/4 in) in diameter, packaged 2 per card. A simple, versatile fastener for shirts, cardigans, childrenswear and accessories, providing a neat, low-profile finish. Attach by hand or with a machine button-sew program. For thicker layers, add a small thread shank to prevent puckering, and verify placement so tension is balanced and the button sits flat.