On 14 Nov 2006 13:17:17 -0800, "dean" wrote:

Ok I know i can drill a whole load of little holes in a circle and then
knock it out, but is there such a thing as a 4" drill bit that will do
this more easily?



Why not just punch a cinderblock-sized hole with a 5 pound mallet,
and then stuff mortar in everywhere that's not part of the 4" hole?