Scale of Button Sizes Buttons are measured by the English standard of 40 lignes per inch. Therefore, a 30 ligne button is 3/4" diameter, a 45 ligne
button is 1-1/8" diameter, and so on. The diagram shows the size of a
button shell before covering.
Zinc-plated
steel, Handy button backs resist rust and corrosion. Two
types of Wire-Eye Backs are offered -- the standard heavy-duty wire eye and
the smaller loop eye back for more delicate materials.