I HAVE HUNDREDS OF TIE TACKS, TIE BARS AND CUFF LINKS. cuff links: 0.79" x 0.79" (13/16" x 13/16" or 20mm x 20mm). I always try to point out any clear blemishes and condition. collar bar: none. tie tack/bar: 2.25" x 0.79" (2-1/4" x 13/16" or 57mm x 20mm).