The carbide button will offer easier extraction through case necks, which will help prevent case stretching and lessen case trimming.
This will provide greater case life.
The carbide button also floats free on the rod to allow for self-centering in the case neck.
The button can also be adjusted into two positions on the rod.
This will allow it to be positioned for various cases of given calibers.
It will allow the user to adjust when the button pulls through the case neck so the press linkage can be positioned for better leverage.