On Thu, 03 Nov 2011 23:21:52 -0500, Martin Eastburn
wrote:

I like hole punches. Knockout punches. 5.5 sounds like a standard.

Check out Conduit hole punches at Home Depot or your electrical supply.

Greenlee seems to go up to 4-1/2".
Irwin, DeWalt, and Morse have bimetal 5.5" hole saws, though.

--
The unexamined life is not worth living.
--Socrates