This ELAN shank-back button is made to sit slightly off the fabric, providing thread clearance that helps closures fasten smoothly on layered garments and accessories. Each card includes 2 button(s) in 20 mm (3/4") so you can replace missing buttons or keep a consistent look across a project. Sew through the back shank by hand, test the fit in your buttonholes, and adjust thread tension for a secure finish.