Which Rounded Nut/Bolt Remover

[nkaminar]

My first car was a 1927 Chevy. I was 14 at the time and the first thing I did was to take it apart and paint everything and put it back together. All the bolts in the body were rusted solid and I used a nut breaker to split them or a metal chisel to cut the bolt in half. The nut breaker was a device that gripped the nut and had a sharp point that was pressed into the side of the nut when a bolt on the nut breaker was turned with a wrench. I don't know if they are still made. That was a lifetime ago.