This sling is used as a personal anchor and extended rappel Sling.   It is girth hitched to your harness,  onto the belay loop or through your leg loop and belt loop of your climbing harness.   The built in loop is a personal anchor point for multi-pitch climbing, or a rappel extension.   If doing multiple rappels,  you use a locking carabiner at the end of the sling to attach to anchors as you complete one pitch of the rappel.