pin comparisons

[A440A@AOL.COM]

I wrote:
<<   I used 1/0 pins from Pianotek in a Steinway plank.  I 
> drilled 
> it with a new "C" bit in the bass and middle section, switching over to the 
> 
> "D" bit for the last two octaves. 

Dale asks: 
>>>What is the decimal equivelents for these bits?
    The C is .242", the D is .246" and the E is .250".   I have used an E at 
the top, thought it left too little margin for long term safety.  

Regards, 
Ed