4LIFETIMELINES Handheld Tubing Straightener – 3/8” Inch Tube Straightening Tool for Fuel and Transmission Lines – Use with Copper, Stainless Steel, Steel, Aluminum Tubing – for Bent and Coiled Tubing

Easy to use and does a nice job straightening out tubing that comes in soft-roll form.

Works as expected, lot of reviews of other stating it doesn't work as well.. went with the brand I know and more expensive and it works. I doubt it's really worth the price if only doing one car but I've found in the past doing more complicated and important jobs that the better tool is always better in the long run.

Generally, works well. The first 3-4 inches of the tubing need to be straightend by hand or it may jam while starting to push the tubing through. Once through, it straightens out very easily. The coiled end of the tubing must be gently uncoiled as you go, to push through more easily. If your "straight" tubing has a gently arc to it, just run the tool back and forth once or twice while rotating it. It is not intended to straighten out kinks or dents. It will not unbend pre-bent tubing.

it works, I found 45 degree changes per run down the tubing to help straighten it out a bit more

I am sure this would work great on softer metals but stainless is too much for it.