On Mon, 19 Nov 2007 02:53:29 GMT, Tony Hwang wrote:

Hi,
What is toughest drill bit for drilling many, many holes
thru a bolt stuck in a confined space. I am trying to drill
it into bits to break it off. There is no other means to get rid of it.
Cobalt bit or any other better one?
TIA,

You're going to use drill BITS to break a bolt into BITS....
I think you are a BIT crazy ! or maybe pulling our legs a BIT.
But whatever you do, be sure there are no dogs nearby, or you may get
BIT.