Review on 🔧 Amerbm Exhaust Pipe Expander Stretcher Tool Set 1-5/8 to 4-1/4 Inches with Rubber Rings - 12PCS Muffler Pipe Spreader Automotive Car Tool Kit - Tail Pipe Tube Expander Tool for Better Performance by Jeff Johnson

This is an amazing tool, better than the one we old school mechanics grew up with, the next best option after a full hydraulic pipe tool because it's made that way in stock. *BUT* there is a big catch here; The hex bolt you use to tighten the expander has an unusual ball size. It's over an inch, under 1-1/16, 25mm is too small, 27mm is too sloppy. It's either 1-1/32 or 26mm, I don't know because I couldn't find it at any store that sells tools. Most kits even skip these sizes. I ended up with 1-1/16 which was messy. This caused the hex points on the drive bolt to chew slightly, but not excessively. To be honest they could have made it a 1 inch hex and it wouldn't have lost strength. Change that little detail and it's a slam dunk.