3M DBI SALA Nano-Lok XL 2.8m Extended Single Leg Web Self Retracting Lifeline with Scaffold Hook 3101620Nano Lok is ergonomically designed for ease of use and is ideal for direct connection to most harnesses. The extremely compact and lightweight design is virtually unnoticeable on your back, staying out of the workers way and making it ideal as a lanyard replacement. Whether your application requires single or twin leg configurations, mounting to an overhead anchor or for connection directly to harness, there are dozens of models to choose from to suit