OK-dumb question senior moment.I am finally going to get a second look at this this morning.What is the max gauge conversion to thickness in steel and aluminum?

I also found a Miller Zip cut 220 unit that I am second in line to look at.Thing is those went back to the min 1980's and I don't know how old it is even through the seller is saying it has a yr old gun.Looked on a search on line that some of the older zip cutters by Miller had electric problems.