I was skeptical, but it worked!
I bought a pair of expensive shoes, but they were marked down 80%.
I didn't realize until AFTER I'd worn the shoes why.
The sizing was off!  Wayyyy off!
The right shoe was about a 1/2 size shorter AND narrower than the left.
Since I'd already worn the shoes, I couldn't return them.
So, I used this wood contraption to stretch the right shoe.
Works great!
(BTW, it's didn't do much for the length, but I managed to stretch the width enough to at least make the shoe wearable)