Review on Universal Exhaust Muffler Tail Pipe Expander Kit, Fits 1-1/8" To 3-1/4" Pipes, 3 Piece Set With Carrying Case - Improve Your Vehicle'S Exhaust System With GZYF! by Paulo Heisler

Used the largest in an attempt to expand a 2-3/8" galvanized fence post. Wanted just enough expansion so that it could slide over another 2-3/8" post for 2-3 inches. The tube did flare slightly but no where near what I needed. I am unsure of the end result had I been Hercules and continued to either successfully flare the tube or break the tool in the attempt. I used a 3 ft. beaker bar to turn while a vise held the post. On the positive, it is a nice case with pretty (useless) tools inside.