I HAVE HUNDREDS OF TIE TACKS, TIE BARS AND CUFF LINKS. tie tack/bar: 2.55" x 0.39" (2-9/16" x 3/8" or 64.5mm x 9.5mm). collar bar: none. 0.25" = 1/4" or 6mm - pretty small for standard button holes. 0.50" = 1/2" or 12.5mm -this is fairly large for standard button holes.
