Three continuously moving independent braking mechanisms prevent freezing in icy or corrosive conditions. Built-in shock absorber limits fall arrest forces to under 900 lbs. and 4 1/2' per second locking speed. Forged steel, zinc-plated, self-locking swivel snap hook on each unit with load indicator that activates and alerts user of impact loading. Lanyard is 3/16" galvanized cable. Capacity/working load is 400 lbs. maximum and 75 lbs. minimum. Meets all applicable OSHA regulations and ANSI standards, including ANSI Z359.14.