Struptsyna bolie useful thing than such a key.
It will be more useful to use it for welding small parts.
The idea is very class.
I have not seen such a thing yet yet another useful thing in the garage...
Who makes you use the key for loosening, twisting? It can be used as a small clamp with a handle - pulled two small pieces of iron, and then hold it in your hands, squeeze it in a vice, put it in the slot if you need free hands, and boil or grind! ..... to do!
