Shirt studs: 0.27" x 0.27" (1/4" x 1/4" or 6.5mm x 6.5mm). collar bar: none. Color: gold, white/colorless . 0.25" = 1/4" or 6mm - pretty small for standard button holes. 0.38" = 3/8" or 9mm - also fits standard button holes.
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