The dual curve of these nuts keeps them in constrictions. I have never had one dislodge for any reason, and they fit most placements well, especially in granite. This is especially important considering that they are the lightest nuts around, meaning that they will need to be carried in the alpine. Tiny crystals that would break off for other nuts seem to do great with these, the triangulation of forces that is created keeps these nuts in where they should not. The full set will hook you up, and getting anodized HB offsets after will really round out your selection of nuts. BD stoppers just don't compare with their straight sides, and other companies have the curve going the wrong way to make placements easy.
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