New tool addition

My dad gave me an old school Muffler removal tool. My stuff is packed away right now and I can't even google a pic. It's a hex shape 3/4" stock 12" long bar that has a 1/8" cutting blade on it. You hammer along the old muffler pipe after you remove the clamps and it slices a 1/16" groove off the outer pipe for easy removal.Anyone got one ?