Installing dead bolt

I only know of one type of hole saw. If you are talking about the round cans with teeth on the edge that thread onto a mandrel, then we are both talking about the same thing. Lennox, Morse, Milwaukee, etc make these for cutting steel. They can be used on wood, aluminum, brass, etc.

Yes, drill your door with it.

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It is very thin. I have never done it but I did watch a locksmith do one. He used el cheapo standard hole saw. I asked and he said each "blade" is good for 2-3 doors before they burn out.

I did notice that he used a moderate speed.

Maybe Stormin Norman will respond to your post. I think he worked as a locksmith for some years. I will defer to his opinion.

Colbyt

Ditto on this response. You can get a metal-cutting version of the saw blade at a hardware store. I had to do this recently to cut holes in a car door -- holes through the interior steel skin to reach the bolts for the window motor. Worked fine and didn't take too long.