What Is That Hole In A Knife Blade Really For?

It's not uncommon for the blade of a knife to have holes in it, but why is that? What are they there for and does it help ...
ReXtorer on MSN

Restoring a forgotten switchblade knife with a wolf emblem

This knife was found in the forest. Knife in the form of a wolf. The blade and button of the knife were very rusty. I decided ...