The Miller Falcon Edge 20 ft. Self-Retracting Lifeline is designed to protect worker when lifeline could come in contact with an edge.  Made of high impact-resistant nylon.  Features 7/32 in galvanized steel cable lifeline, zinc-plated steel snap hook and carabiner, and cast aluminum hub.  Maximum working load: 420 lbs.  Maximum Arrest Distance: 54 in.  Maximum Peak Arresting Force: 1800 lbs.