The punch pin on the Hole Punch Pliers can dull down over time or break if you try to punch through something that is too thick. The beauty of this tool is the pin is easily screwed out and replaced. The plier comes with one replacement, but if you need more, here they are in packs of 5.
These little pins really come in handy when your punch is wearing out!
I keep these on hand if the punch pin were to break. So far it hasn't!