I HAVE HUNDREDS OF TIE TACKS, TIE BARS AND CUFF LINKS. tie tack/bar: 2.38" x 0.22" (2-3/8" x 3/16" or 60mm x 5.5mm). I always try to point out any clear blemishes and condition. collar bar: none. 0.25" = 1/4" or 6mm - pretty small for standard button holes.