The Rollgliss Self Rescue System is one of the easiest manual descender devices available. The system is pre-rigged making it ready to go right away. All you have to do is connect the snap hook to a 1500 lb anchor, put the sling over the user and throw the bag of web over the edge. Then start your descent by pulling down on the handle. This device has a maximum descent of up to 55 ft. using 1 in. nylon web lifeline.