No need to wonder what size Sterling Silver collar stays your shirt requires, because our friends at Swiss Stays have created a brilliant adjustable set. A single pair is all you need and that pair arrives in handsome leather wallet. They are hallmarked 925 on the says assuring you of their authenticity. The patented adjustable stays can be adapted to fit any of the 24 dominant collar sizes. Please see our additional image that shows the various adjustments. This picture happens to be our blue titanium set, but the adjustments are the same. Stays are adjustable to four lengths: 2", 2 1/3", 2 1/2", 2 3/4".