My vise had serrated jaws. I made a set of steel V jaws with a horizontal V and a vertical V for holding round stock. A set of aluminum jaws for delicate parts and a set of delrin for riley delicate parts.
started making a set of flat steel jaws today - once those are done I am going to either make a set of aluminum jaws or maybe just magnetic aluminum caps. Not sure which way I will go with that part yet.