As for another review - as a plumber in the Virgin Islands, I know very well that not only do these drills not eat nails, they break them. Cut nails are much harder and less flexible steel than regular nails and also much harder steel than these non-carbide bits. I try not to hurt my nails when using it. This will destroy your cutting edge in a matter of seconds. Luckily they're quick to sharpen with a Dremel and I always keep one handy in my truck. If I can't get around a nail, I switch to a bi-metal hole saw. While the Selfeed is actually a forstner and will level the entire hole, the hole saw makes it much easier to cut around the nail, and these bits are good for metal too (although clipped nails will likely rip their teeth out). The downside to hole saws is that most of them only drill up to two inches and are much, much slower than self-tapping screws. Also, it is tedious to remove the wood core after each hole. The professional captures both and keeps his eyes open.