Durable and lightweight cast aluminum housing with stainless steel working components for corrosion resistance 85 ft. 3/16" galvanized steel wire rope for durability - stainless steel also available Reserve lifeline retention system maintains a 2 ft. reserve for shock absorption and added safety Self-locking swivel snap hook with impact indicator enables user to visually check to see if the device has been impact loaded Swiveling anchorage loop and hook to prevent twisting and tangling of lifeline Meets or exceeds all applicable industry standards including OSHA, ANSI and the stringent ANSI Z 359 This Ultra-Lok®; SRL comes with a very durable aluminum housing, a 3/16" wire rope lifeline and stainless steel working components 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.