Those look like they might have too much give for my liking. To be honest, about 30 squares back I made some jaw covers from muffler tube. It seems to do the job, covers the aggressive diamonds in the jaws and is smooth metal so it doesn't give. I too have a big vise...second biggest they had at house of tools... I was hoping to get the big one like we had on the five ton wrecker front bumper. I think you'll be OK next try...