SINGLES(2) 7/16" Knots Gold Tone Vintage Formal Tuxedo Shirt Stud f17

(7/16" or 11.5mm). collar bar: none. Color: gold. 0.25" = 1/4" or 6mm - pretty small for standard button holes. 0.38" = 3/8" or 9mm - also fits standard button holes. 0.50" = 1/2" or 12.5mm -this is fairly large for standard button holes.