[prairieschooner]

But I grab for these almost all of the time: http://www.amazon.com/DLC-HT108-Adjustab...B0002KRAC4
By far my favorite.

I agree with Forest although you do need to be careful not to cut the strands at the same time. I don't bother setting them with the adjustment unless the wire is fragile, very thin etc.
PS I use this style of Crimper. If using an Insulated Terminal then you do need to use a better grade than PVC like Nylon though.
http://www.amazon.com/Thomas-Betts-WT111...mping+tool