SINGLES(1) 3/8" Rhinestone Vintage SAKS 5TH AVENUE Formal Shirt Stud g86

Shirt studs: 0.36" x 0.36" (3/8" x 3/8" or 8.5mm x 8.5mm). 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.