I presume they are steel? If aluminium expect eventual crack n fail.
Why? Polishing improves the fatigue life. Mirror-polishing the surface eliminate scratches that could start a fatigue spot. Or where you referring to the shape of the bar?
@Oswald started
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Why? Polishing improves the fatigue life. Mirror-polishing the surface eliminate scratches that could start a fatigue spot. Or where you referring to the shape of the bar?