The DMM Revolver Carabiner is an incredibly useful piece of gear to have on your rack. With a pulley roller located at the apex of the carabiner they are used to reduce rope drag on a meandering rock pitch or reduce friction from your crevasse rescue system.
The Revolver is made with an I-Beam construction as to reduce the weight of the carabiner without impacting on its strength. It also has an alternative function as a pulley in emergency rescue situations.
DMM Revolver Carabiner Features