This is the one I have and it has been used, abused, beat all to hell, dropped, run for hours at a time, dropped on the garage floor etc and still works like new:
https://www.harborfreight.com/53-amp-12-in-x-18-in-bandfile-belt-sander-58155.html
I use
3M Cubitron II 33445 60+ Grit File Belt, 1/2in x 18in, Box of 10 which are very durable.
You will never use a hand file ever again. And you can get into a lot of tight spaces and smooth grind metal extremely quickly and effortlessly and do a far better job then many other tools. I regret I didn't buy one sooner.....