ELAN 4‑hole buttons deliver a classic, stable attachment for shirts, knitwear and light outerwear. The card includes 2 button(s) sized 15 mm (5/8 in); four sew‑through holes distribute tension for a balanced stitch that resists twisting at stress points. Sew by hand or machine, confirm the size against your buttonholes, and backstitch or knot securely to withstand routine wear and laundering. Choose a finish that complements the fabric and test on a scrap to verify feed and tension.