A cheap made in china knife, integrated pocket clip, with a unknown type of stainless blade.
It was $8, and hasn't broke yet.
Got tired of abusing my nice knives at work.
Pretty much, that's what it stems from. Here is a link to a description of it for the non video phones...
http://bowieknifefightsfighters.blogspot.com/2011/05/wasp-injection-knife.html
I've never needed more than one. But when mine went permanently missing, I went and bought the same one again.
It will be rough if I have to try and find another though, since they quit making that model.
Great daily use knives!
I carry a Spyderco Pro Grip, love it for everyday use, wouldn't be my choice for defense, unless it was a last ditch effort.
If defense is your only reason to carry it, get a good fixed blade. I have a cold steel for that.