The DMM Revolver Rig Durolock carabiner is a connector with an integrated pulley sheave. It features a high efficiency roller bearing sheave, threaded removable captive bar and a full strength textile friendly becket. The uniquely profiled spine and captive bar aid in maintaining correct orientation. The design of the Revolver Rig is such that when using a connector attached to the becket any friction between the connector and rope is minimized.