These are 16 ligne buttons, the same size used for men's shirts. They are 10.16mm in diameter and have holes sized for sewing. Corners are nicely rounded, and the inside of the button is concave on the front. Possibly useful during a wardrobe emergency :)
SolveSpace file is included so that you can modify to your needs.
Button10.16mm.slvs | 2.2MB | |
Button10.16mm.stl | 252.5KB |