In as much as **prixat** voiced the opinion,

I think its a Wire Stripper.

I thought it would be nice to show y'all an image of my wire stripper [above]. 

Please take special note of the serrated areas of the jaws -- although each
grove is designed for a specific wire size (and marked in both AWG [American
Wire Guage] and metric sizes) ... those jaws are rather non discriminating
when the time comes to bite your finger, hand, the web between thumb and
hand, ... etc. 

I speak from vast experience ... and experience is a painful instructor. 

--
Martin