ELAN shank-back buttons in 23 mm provide extra clearance over thicker fabric layers to 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 on by hand with strong polyester thread and secure with a few wraps to form a thread shank if needed. Match the button diameter to the finished buttonhole and reinforce stress points for long wear.