The 3M DBI-SALA Nano-Lok Edge Self Retracting Lifeline, 3500217 is a self retracting lifeline (SRL) designed with a speed-sensing brake system that stops a fall within inches to keep you safe when you're working at heights. Equipped with 8 ft (2.4 m) of 3/16 in (5 mm) galvanized steel cable, thermoplastic housing and corrosion-resistant hardware, this lifeline also includes a swiveling anchorage loop, a self-locking snap hook and a built-in connector for single-leg direct attachment to a harness. Specially engineered for foot-level tie-off, this lightweight SRL stays out of your way as you work, retracting as needed to minimize trip hazards. The 3M DBI-SALA Nano-Lok Edge Self Retracting Lifeline edge is specifically designed for foot-level tie-off and sharp edge applications often found in construction. Nano-Lok locks quickly stopping a fall within inches providing more protection at low heights. In addition, tension is always kept on the lifeline, which reduces dragging, snapping and trip falls. Both features are key safety improvements.