I used these last week to attach 2x4 boards to my basement wall while framing/insulating the basement during a renovation I'm working on. Now that I've used them, I can safely say that if there's any difference between them and the (much more expensive) TapCon anchor box I bought at the big box store, I don't see it. worked perfectly and I had no problems with the anchors unwinding or not snagging on the stone wall. I use them on a concrete block wall which can make a difference but using the included hammer drill gave great results.
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