This is a 6 gauge wire with 4 gauge markings. I use a 4 gauge hydraulic crimping tool for real wire and wanted to try a new brand, with a 4 gauge ring terminal and the correct crimp die the wire would easily fall out. I had to switch to a 6 gauge and cube ring terminal to get it to fit properly. If you have to walk a full 20 feet and expect 150 amps, this cable won't cut it. It's good quality wire, it's just mis-sold.