This is an excellent tool. To strip wire of any guage between 12-22 simply put the wire and squeeze the handle. Adjusts for different size gauge automatically. I also like that the jaws are a 1/4" wide so all you have to do is put the end of the wire to the end of the jaw and you get a consistent 1/4" strip every time.
The only reason I gave it 4 stars is mine is starting to wear them out. The joint is getting loose and the handles have significant play in them now. That being said I have used them on numerous projects over the last years, probably thousands of wire connections.
I will definitley buy another pair of these and reccomend them to anyone tackling an electircal project that requires more than a handfulf of connections.