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It's possible that in the manufacturing process, the press that flattens the ends of the bar also stamps the three boltholes. But as the bar cools, the holes get slightly deformed. To remedy this, they true the holes up using some kind of beveled drill bit or stone grinding point. That may be what created the bevel on the outer hole in the photo. But for some reason, the center hole on each side didn't get this remedial step.
If my bar is like this when I get it, I will likely attempt to true the holes with a cone-shaped grinding point on a hand drill. That will create a more "factory" looking and perfectly round hole. Then I will paint the bare metal edges so they don't rust.
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