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Message: <blockquote data-quote="Andy™" data-source="post: 554184" data-attributes="member: 2012">i don't even use pilot bits to start the hole. partially because mine can't take a pilot - they have built in extraction using the centre bore so a pilot bit doesn't fit ineasiest way is i have a piece of wood with the relevant core size hole in it. the wood is screwed to the wall and you can use that to start your hole. and if you have the holes in your wood in the same place as the fixings for your fan, then you don't need to drill any more fixings holes since they are already thereor you can just kinda hold the core on an angle and start it that way. its messy and exact starting point will vary from where you can it, along with chewing up some of the wall, but if its being plastered / tiled etc later then that doesn't matterprobably worst one I've done, wall was about 800mm thick. mix of stone, cement, other ***** etc. core drill went through and cut no problem at all. the problem was getting in far enough to break out the bit that's been cut, so that the core drill could then get further in and keep going</blockquote>