Getting back on topic, y'all.

I bought one of those little Gerber knives before I started collecting survival stuff. I keep it on my keychain for trimming the bite marks on my dog's frisbees. My wife liked it, so I got her one two. I lost it for awhile, and bought a replacement, and when I found it again I put it in my PSK as a backup knife. So I've got 3 now. It's going to be hard to justify getting a 4th little knife, but if it's better, well...

What's the groove for just inside the edge?