I actually found a pair of bent needle nosed pliers that sounds much like what you described that you had made amongst my tools! So why is it good for wire? I assume you grasp the end of the wire using the groove - but why?
What differences does it have and does it make to use that over, say, nylon pliers or flat needle noses? What advantage does the groove gripping the end of the wire do for what sorts of tasks?
Trying to think of where I would find that useful and just coming up blank.