I HAVE HUNDREDS OF TIE TACKS, TIE BARS AND CUFF LINKS. tie tack/bar: 1.77" x 0.38" (1-3/4" x 3/8" or 44.5mm x 9.5mm). collar bar: none. 0.25" = 1/4" or 6mm - pretty small for standard button holes. 0.38" = 3/8" or 9mm - also fits standard button holes.
This product would be a great fit for those looking to add an initial or monogrammed letter to a tie bar clip to personalize their formal wear.