I HAVE HUNDREDS OF TIE TACKS, TIE BARS AND CUFF LINKS. tie tack/bar: 2.10" x 0.63" (approx. 2-1/16" x 5/8" or 34mm x 15.5mm). collar bar: none. 0.25" = 1/4" or 6mm - pretty small for standard button holes.
This product would be a great fit for Shriners' houses and events.