3M™ DBI-SALA® Nano-Lok™ Self-Retracting Lifeline is ideal for direct connection to most harnesses. Whether the application requires single or twin leg configurations, mounting to an overhead anchor, or connection directly to a harness, there are numerous models to choose from that suit almost any application. 3M™ DBI-SALA® Nano-Lok™ Self-Retracting Lifeline locks quickly stopping a fall within inches - providing more protection at low heights. These features are key safety improvements and provide the user with additional security on the job.