I need to drill a 105 mm diameter hole in a masonry wall 300 mm thick.

It is for the installation of a Miele vented dryer.

All I have is a 750W Bosch SDS Plus drill and some long enough drill bits

What other bits and pieces do I need?

I guess I need one of these:

http://www.screwfix.com/app/sfd/cat/...88072&id=17748

and one of these:

http://www.screwfix.com/app/sfd/cat/...8110&id=14520#


I have a 20mm drill already, can I use it as a pilot drill?

Also, what tips and advice do I need to take into account?

How do you break the core? With a hammer and chisel?

I have never drilled a hole this big. I have drilled the same wall for a 15mm pipe with a normal SDS Plus drill and was easy, but 105mm is new to me.

Thanks,


Antonio