I HAVE HUNDREDS OF TIE TACKS, TIE BARS AND CUFF LINKS. tie tack/bar: 1.60" x 0.53" (1-5/8" x 1/2" or 40mm x 13.5mm). 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.
The "S Monogram Initial Letter Vintage SWANK Tie Bar Clip" would be a perfect fit for events, casual wear, or formal occasions when you want to add a touch of style and sophistication to your outfits.