After breaking a pilot bit on a bi-metal hole saw, I came across this hole saw for cutting through a stainless steel electrical enclosure (NEMA 3 / 4 / 12). I used with a Dewalt 20V cordless drill set to 1 (lower torque) and held the trigger about halfway down to try to get to 200 rpm (full speed on 1 = 600 rpm). I used Oatey dark thread cutting oil.I was highly impressed by how easily the tungsten carbide teeth kept moving in the metal at such a low speed. I'll be buying a few more of these hole saws for other sizes I need.
Darren Alcorn