It's made of 6061 aluminum, and it looks like it was cut from the solid. Problem is, it's not beefy enough for aluminum. The other problem is that the inside corners aren't radiused and are potential stress risers just waiting to propagate a crack once fatigue sets in. As mentioned, the bolt application is wrong. In a shear application, there should never be threads across a shear plane.
If they were cutting it from a billet, there's no excuse for not making it stronger. Less metal would have to be removed, and that would cut down on machine time necessary to make it.
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