I have the Large Classic Scallops (or something like that), and the largest scallop circle is 4" wide.
I think I found the information you're looking for at the Cut at Home website when I was researching it, too. They give you the smallest and largest dimensions and tell you the increments that they go down. You can find the whole Nestabilities category here:
http://www.ucutathome.com/store/inde...scat=y&scid=37
HTH!