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In my opinion you cannot use the BD wire gate oval that comes with their nut set to hold your nuts. You need a solid gate (oval) biner. I was told this by a climbing mentor once before I led a climb (with my new nuts and accompanying wire gate biner). I thought “ok, sure, I'll think about it” at first. And then during the climb I experienced the reason why a wire gate biner is not a good idea here. When testing the nut, giving it a good tug with the biner/rest of the nuts, the placed nut somehow came free off the biner. What?! That week I purchased this solid gate oval and have never had this issue again. The gate action is also smooth and a great resistance. If somebody stole this biner, I would buy it again. I wish BD would sell their nuts with this solid gate instead.
I'm too lazy to take all my nuts off this biner to use it for my glacier travels, so I use the oval wire gate biner that came with the nuts for my rescue system instead (with pullys/prussiks). Because ovals really do work a ton better for a pully system.