ELAN shank-back buttons in 23 mm provide extra clearance over thicker layers and reduce abrasion at the buttonhole. Each card includes 2 button(s). The integrated shank keeps closures smooth and easy to fasten on coats, cardigans, bags and structured pieces. Sew by hand with strong polyester thread and secure with several wraps to form a thread shank if needed. Match the button diameter to the finished buttonhole and reinforce stress points for long wear.