"Dave D" wrote in message
om...
Hullo again.
I have to drill a hole in my exterior wall for my combi flue, (its
sandstone)
I believe I need one of these big cake cutter type drill bits, what
are they called ? Do I need a special drill or is my little 850w house
drill up to the job ?
Is this the kind of thing I can hire ?
Cheers

You`ll need a 110mm core cutter. Ebay is your best bet for a cheep one.
I wouldn`t trust a small drill with it though, will probably burn it out.
You might want to invest in a more powerful SDS drill.
Alternatively just hire the lot from your local tool hire

John