Classic four‑hole sew‑on buttons in 20mm (3/4"), supplied 3 per card. Four holes provide a strong, durable attachment with parallel or criss‑cross stitching. Suitable for shirts, dresses, trousers, uniforms, knitwear and accessories, as well as general mending. Low‑profile shape sits flat for a clean finish. Install with standard needles and thread; knot securely and check spacing before sewing remaining buttons.