What burs are needed the most for setting job? I noticed that in Young's Stone Setting book ball burs are mostly used.
So, ball bur set is in shopping list. Do I need ball burs from 5 to 8 mm also?
Cup burs are also in wish list.

What about hart burs? I definitely need some of them, but which ones? 90degrees, 70 degrees? I have mostly 5-6-8 mm gems for setting. All I found in books is information that hart burs exist, that's very helpful.
Setting burs? Do I need them at all?

Help please
And I promise, no more questions... for a while.