  
The Revolver has a small revolving roller recessed into the base of the biner where the rope runs. This is designed to reduce rope drag - basically you should use the Revolver on placements that are off to the side of the natural "line" of the route or anywhere where you would normally add an extra sling to prevent rope drag.
The Revolver is a lot lighter than it looks (58g with sling), thanks to it's innovative hot forged design, and is also useful as a pulley in rescue, hauling, rigging and showing off to your buddy situations.
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