Stainless steel working components for corrosion resistance
 50 ft. 3/16" galvanized steel wire rope for durability
 Reserve lifeline retention system for added safety
 Self-locking swivel snap hook with impact indicator
 Swiveling anchorage loop to prevent twisting of lifeline
 Meets or exceeds all applicable industry standards including OSHA, ANSI and the stringent ANSI Z359
 Ultra-Lok® SRL's come with a durable glass-filled polyurethane housing, a 3/16" wire rope lifeline and aluminum side plates for maximum durability and minimum weight. For added security, Ultra-Lok® systems have an anti-ratcheting twin disc brake system with an audio indicator to let you know it is functioning properly.
 

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http://www.magusintl.com/ppe/ViewProductDetails.asp?ProductID=1649&aID=Fall%20Protection&L=1&CategoryID=343&CN=Self%20Retracting%20Life%20Lines