I'm relocating my fuel oil tank and need to drill through the foundation wall. I've been looking at the rental places. I've seen a handheld watercooled diamond core drill. Also a handheld dry rotary hammer carbide core drill. The one place also had a mounted watercooled diamond core drill, but I didn't see it. A big concern is what to do if I hit a piece of rebar. Would a watercooled diamond core drill go through the rebar? I'm thinking perhaps a carbide tipped hole saw or maybe a sawzall. The hammer drill was quite heavy but had a pilot drill. I don't know how level and square a handheld drill can do. I'm thinking tomorrow I will take a closer look at what is called "freestand core drill" in their price sheet. Any suggestions?