What is the small curved "blade"?

[supratentorial]

I have owned a couple of those, but never tried one on a can. Wonder how they work??
Scary looking technology!!!

@waynorth just squeezes the spinach out of the can.

 

[Dr-Mabuse]

I've used the 99 scout for punching drain holes in a paint can on multiple occasions. It worked pretty well.