3M™ DBI-SALA® Nano-Lok™ Extended Length Self-Retracting Lifelines are going to great lengths to help improve fall protection.  Available in 9 ft. (2.75 m), 11 ft. (3.35 m), 15 ft. (4.57 m) and 20 ft. (6 m) lengths, the family of Nano-Lok SRLs combines fall protection with ease-of-use and comfort for even more applications. Speed sensing brake activation system provides protection at low heights. Tension is always kept on the lifeline, which helps reduce dragging, snapping and trip falls. Durable nitrile energy absorber is a smaller design and last four times longer.