Question: Gentlepersons, I need to drill into a ceramic chimney liner to develop an additional flu entry for my new wood stove. What's the best drill bit and power tool to use to achieve this task...drill holes into the ceramic flu without cracking the flu. Answer: I use a carbide masonry drill bit. We've used both regular drills and hammer drills and usually drill a series of holes around the perimeter of the hole. Them, simply use a hammer or hammer/masonry chisel to break out the tile. If you use a hammer drill, a setting that is less percussion and more revolutions may work best...depends on the hardness of the terra cotta.