3M™ DBI-SALA® Ultra-Lok™ Self-Retracting Lifeline's (SRL's) are rugged, highly engineered devices that can be counted on for user safety, efficiency and reliability. The SRL extends and retracts automatically, allowing the user to move efficiently and comfortably at normal speeds around the recommended work area. The Ultra-Lok is light in weight thanks to its glass filled polyurethane housing (25 m model uses aluminium housing). For operational longevity, all models use corrosion resistant stainless steel working components. For complete versatility in a variety of applications, the Ultra-Lok is available in 4 lengths; 6 m, 9 m, 15 m and 25 m, with either 5 mm diameter galvanised cable or stainless steel cable. At the end of the cable is a double action snap hook for attachment to a harnesses fall arrest point. This double action snap hook has a built in swivel and fall arrest indicator. The reserve lifeline system built in to this SRL allows the brake and energy absorption system to function properly even if a fall occurs when the cable is fully extended. For added security, the UltraLok features an anti-ratcheting twin-disc brake system, with an audible indication that the device is functioning correctly.