We have three fence pliers, FP20, FP216 and FP222. There are two types of pliers, VR16 and VR22. 

FP20 - takes both VR16 and VR22

FP216 -  takes only VR16

FP222 -  takes only VR22

The biggest difference between FP20 and FP216/FP222 is that the latter two have a high capacity magazine.

Some of our garden and fence pliers have a built-in magazine that can be loaded with hog rings. See below on how to load them.