Milwaukee Carbide HoleDozer Hole Saws - Stainless, Cast Iron, Ceramic, Fiber Cement NPS17

[@daibhiseaghdha153]

how about a demo on cast iron. just to see if it works. I wish I had knew about this one, as I was cutting a 57mm diameter hole, in a 4" cast iron soil pipe, about 1/4" wall thickness, with a bimetal hole saw, it took ages to do it, and some of the teeth came off.