I am in the process of adding a shower stall to a downstairs half bath and needed to "dig" a six foot drain pipe trench in the foundation. This probably is not the best tool to do that, but I gave it a try. I successfully drilled numerous 3" holes to create the trench and used the 4" bit to dig out space for the shower trap with no problem, this thing is rugged. I did let the drill cool down after drilling every three holes just to be on the safe side. I hit rebar several times, I thought that might eventually dull the bit but it didn't seem to. I did hit a copper water pipe in the foundation, at least the drill was helpful in getting access to the damaged pipe. I definitely felt I got my money's worth out of this drilling machine.
Kenneth mitchell 
