drill bit size

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Brent

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Nov 7, 2004
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Illinois, USA.
I have been using 7mm,8mm,10mm drill bits for the kits that I have been using. I noticed that some companies use letters instead numbers. Just wandering if anybody could tell me what the size "O" is
 
Drill bit size chart here:

http://www.penturners.org/content/HUTDrills.pdf

8 mm drill is .3150" - Letter size O is .3160" or
.001" bigger than 8 mm.
 
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