Classic four-hole sew-on buttons in 18mm (3/4"), supplied 3 per card. Four holes allow strong parallel or criss-cross stitching for dependable hold. Suitable for shirts, dresses, trousers, uniforms, knitwear and accessories, plus general mending. Install with standard needles and thread; knot securely and check spacing before sewing remaining buttons. Designed for reliable performance in everyday wear.