DBI-SALA Sayfline Cable Lifeline System - 20 ft.* The 20 ft. Sayfline system is a complete kit that is easily installed with no special tools or equipment. * The Lifeline System is lightweight and portable allowing you to move it and reuse it over and over again. * The Lifeline System comes complete with a cable lifeline assembly and turnbuckle device to add tension for easy use. * The Sayfline System incorporates the Zorbit shock absorber for added safety, it allows you to use a standard 5,000 lb.