Durable ELAN 4-hole sew-through buttons in 20mm (¾ in) designed for shirts, uniforms, knitwear and light outerwear. Each card includes 2 button(s). Four holes spread strain for closures that hold up to repeat wear and laundering, while the flat profile lies smoothly on plackets. Attach by hand or machine using a thread shank where thickness is needed. Match button size to your buttonhole and check spacing before final stitching.