So, what is better about the aluminum rings you guys have over the steel ones at Lowe's?

Is it a weight thing?

I can get the steel rings for 78cents a piece and they have a working load of 200lbs. If there are two on each side then that would be a working load of 400 right?

I know I may have to file down the bur, but that doesn't seem like a big deal.

Is there something I'm missing here?