SINGLE OR PAIRS OF TUX STUDS TO REPLACE MISSING/BROKEN PIECES OR ADD TO YOUR SET FOR NEWER STYLE SHIRTS. shirt stud: 0.21” x 0.34" (approx. 3/16 x 5/16" or 5.5mm x 8.5mm). Condition: very good, stud slide is smooth and spring consistent - SEE PICS - (Hi resolution photos typically show more detail than is visible to the naked eye).