I have one ..they're great. Does it also have a punch on one side? Flange one side of seam, punch holes on overlapping sheet then spot weld holes . Here's a hint; The Harbor Freight tools are excellent for guys like us that don't do it for a living. I bought all the stuff years ago and used the crap out of them and they've never failed. Critical to put two drops of oil in them at beginning of the day. A pneumatic sheet metal shear is another good one to have ..$38 at HF
I had to go back and see what all I missed. Thanks for the tip Al. I need the sheet metal shear and I'll get one soon.