The Stopper Nuts by Black Diamond have a unique transverse taper that allows them to be placed securely in bottlenecks, flares and shallow seams. Rounded corners ensure easy cleaning. Sizes 1, 2 and 3 have straight sides for maximum contact with the rock. Galvanized steel cable.
So sorry, but only 4 items are allowed for comparison, so we're comparing the first 4. I blame the gnomes and so should you.
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