Hi! 10 years ago I spent about a month at the LA County Fair at the Pomona Fairgrounds, and there was a guy there selling flexible cutting/grinding wheels. They attached to standard cutting tools, and they were ~8" or so in diameter. They were _really_ flexible, and one of his standard demonstrations was to drive a big nail partway into a 2 x 4, then flex the spinning wheel flat onto the wood and cut the nail off flush.
Then he'd cut various pieces of pipe, rod, wood, plastic, and whatnot to prove that it could cut anything. Then he'd hit the spinning wheel with a screwdriver to prove that it was practically indestructible.
I think it was some sort of fiberglass mesh impregnated with an abrasive.
Now, of course, it's 10 years later, and I think I have need for such a thing to flush-cut some steel piping set in concrete. I'm not finding the right type of stuff on Google, but that may be because I'm using the wrong words.
Any suggestions? Thanks!