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Hello,

Can anyone tell me: what is a belt sander used for? Is it more
powerful than other types of sander or are they all pretty much the
same; is a 120 grit a 120 grit no matter what machine it's attached
to?

As others have said they can be very vicious things. They'll remove the
target material very quickly (as well as whatever the target is attached to
if you don't concentrate).