This is one of those tools that you may not use often, but when you do, it is priceless! I haven't used it in a long time, it was in the bottom of my tool box at work. I brought it home because I had to splice the pipe together on the Rambler. HOLY CRAP was it handy! I had the muffler shop make me a foot long piece of pipe with a "jog" in it to line up the pipe. I cut a long piece off the muffler to the new piece would slip in side then cut this short piece off the head pipe and butt welded it there. The whole thing was done in minutes thanks to this pipe cutting tool I got from the SnapOn man years ago. It makes a nice straight cut absolutely effortlessly. Thinking of what I would have done without it makes my head hurt.
There are many different versions, the part number of this one is TC90A (click here)