Y Monogram Initial Letter Modern Cuff Links

I HAVE HUNDREDS OF TIE TACKS, TIE BARS AND CUFF LINKS. cuff links: 0.58" x 0.61" (9/16" x 5/8" or 14.5mm x 15.5mm). I always try to point out any clear blemishes and condition. 0.25" = 1/4" or 6mm - pretty small for standard button holes.