Homebrew PCBs

What is the most common size dill bit used in PCB work ?

John I noticed that in your G-code that you used the same size bit 
for both millimg and drilling  what size was it .I was thinking of 
useing a 1/16 bit but the machine I can use has a 3/32 as the 
smallest right now . I think that is way to big .I was thinking of 
useing a #55 dill size for the paths ( 1/16 is bigger I know ) and 
#60 for the mount points these may be to small any thoughts (John)
(Group)

What is the best to use   By the way I am makeing the 3amp driver 
from Steve Blackmore on his site . I have almost completed the files 
meeded to make the G-code . Now I know why G-code is so protected if 
you make one up .

John Brauweiler