Best tool for cutting a large hole in a soffit

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Hi. I've just bought a shower extractor fan kit that requires a hole measuring 115mm in diameter to be cut through the soffit board on the outside of the house. I own hole saws up to 70mm odd in diameter and an adjustable drill bit that cuts into softwood and plaster, but that only makes 65mm diameter holes. I have thought about drilling loads of little holes in a ring and then attempting to cut and push through the soffit, but I don't really fancy doing that 25 feet up in the air balancing on a ladder. What tool would you recommend I purchase to cut a 115mm hole out of my house soffit board? The cheaper the better, because having just started my own business (obviously not diy related! :LOL: ) I'm a bit poor at the moment. Many thanks for your time.
 
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The one on ebay says "Suitable for use on Granite, Marble, Porcelain, Glass, Slate, Ceramic, Tile and Stone!!!"

Arn't soffits usually wood or plastic?
 
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Yeah, I saw those already. I actually bought a set of those last year and they are definitely not suitable for wood/plaster type material. They are rough edged to wear away at stone type material instead. Thanks for looking though. Anyone else know of a tool that'll do it? :confused:
 
How about something like this?

Not very cheap, admittedly. I got a similar one from Tilgear, which
if I remember was a similar price.

If it's difficult drilling overhead and at the top of a ladder, could
you consider marking the position, taking that section of the
soffit down, and drilling it at ground level before refixing it.

P4ult: if you compress the URL rather than copying it as it stands,
you can avoid the text scrolling off several miles to the right.
 
I was just popping back to say that I've just bought something and it looks like a cheap and cheerful version of what you recommended, xerxes. It's called an adjustable hole cutter and it cuts holes in wood, plasterboard or plastic, for use with a brace or electric drill. It was only £7.50 odd from Toolstation, so hopefully that'll do the job. I may well consider taking the soffit panel down now you mention it. Thanks for the help. :D
 

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