And a 5 hp drill to turn it :-)  My vote goes to a 4.5" grinder with a 
cutting disk unless you need a REALLY clean, acurate hole - cheap, easy to 
do yourself and you got yerself a handy tool that you'll use for lots of 
other things.
>Have y6ou considered a "Hole cutter".  You can buy drill bits at the
>hardware store that will drill holes.  You may need to go to an
>industrial hardware store to find one 6" in diameter.
>--
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