Question 390318
Mr. Black's drill bit set includes the following sizes (in inches):
13/64, 7/32, 15/64, 1/4 . . .
What are the next two smaller bits? 
Convert all fractions to 64th
13/64, 14/64, 15/64, 16/64
you can see that the two smaller sizes are reduced by 1/64
11/64, 12/64 reduces to 3/16