I've bought several of these to attach to different parts of my wife's and my beds etc and I'm impressed enough to leave a review. First, our bed has a good frame, so I didn't want to attach junk to it. This is really high quality cast *not welded* stainless steel. With items like this if welded the weld would be a weak point but they are really strong and are a good weight and weight. I didn't mount them to concrete but used the screws that came with them. The screws themselves also appear to be of good quality. I do a lot of home renovations etc and I'm really impressed that they didn't cut corners here. So if that's what you're looking for (I bought closed ones, not open ones) they're definitely worth the money. Some might find this useful, so here are the drill bits I used for the holes. Well, first just add a small pilot hole before using a larger drill so you can make sure your hole is nice and even. After that, the 1/4" drill bit for the screws that came with me worked like a charm. Since our bed frame cost a bit, I hand tightened the screws instead of using a drill press. BTW, I forgot to mention, but because of the quality they look really good on our bed lol.
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