So after running my power and RCA wires today for my new system, i have come to a stand still trying to figure out how to crimp these wires!

The wires are 4 gauge, and all my wire crimpers/stripeprs stop at 8 or 10 gauge, and i havent seen any in stores either.

What does everyone use to crimp their wires? Vice grips? C clamps?

Looking for something professional(ish) and efficient, no hammers please