Fall Safe retractable lifelines are designed to be used as a single person fall protection device . It features a swivel top with carabiner which allows enhanced worker mobility, rugged and durable housing, and unique breaking system that eases shock in the event of a fall.The newest generation of retractable lifelines on the market. Meets the newest ANSI standard; ANSI Z359.14-2012 and rated Maximum Arresting force 1800 lbs and averaging less than 1350 lbs. with the shortest arresting distance of 24" or less ( Yes, you only have to add an extra 2 feet, instead of 4-1/2 feet to your fall distance calculation).