In my yoot, I spent too many hours running one of these: a 2-1/2" drive IR impact gun. That hole in the top/middle is a threaded hole for the big eye bolt to hang it.
It'd hang from a crane and took a minimum of 2 men to run it.
I'd feel it in my bones for a week.
Biggest impact I ever operated was a 4" drive, at the Huntington beach edition generating plant.
We used it to break the head nuts loose on a boiler feedwater pump. Took 4 men to operate it and it had a dead-man's trigger.
Well-named, they're illegal now after a guy got killed by one.
After a couple hours of use the drive square snapped and we had to use an air-arc to cut the remaining nuts. None of us were good enough to scarf off the nuts without getting into the threads, so they brought out an edison old-timer. he was an artist.
Whenever I'm doing something I don't like, I remember days like that and it seems not so bad.