These reamers work fantastic on any drill, but you MUST TAKE YOUR TIME. If you see smoke, stop and let it cool, regardless, dont cut the hole to size in the very first pass, take your time. You can make them fail in 10 seconds, and the tape will come off and the fiberglass rod can splinter if you don't TAKE YOUR TIME from the excess heat build up. There is no cooling fluid used, if you tried the same thing on a mill or lathe or even a drill, you would destroy the bit/tool in seconds. I've had the same set for 5 years and I have replaced the tape on the 2 middle tools because the grit got old, but I have never had the tape come off or the fiberglass rod fail from excess heat Work it SLOW.