Boolean - aliased edges

I’m creating pliers. I need to make a boolean difference on the pliers with a cube, but the result is “sawed”, aliased.
See the bottom that was cut: https://i.imgur.com/QO9dnJw.png

How can I fix this?

Thanks.

Is your object very very small or very very large. If so scale to fit the viewport grid size
Have you changed the viewport clip start and end distances. Only do so if you know why you need to.

Please ALWAYS supply a demo blend file for review with ALL support questions

It’s real-sized, 22 cm (the whole pliers).
I made the whole thing bigger and applied the boolean, but still the same thing happens.

Do you happen to know the upload site preferred by the members of this forum?

Do you happen to know the upload site preferred by the members of this forum?

http://pasteall.org/blend/