Easy operating Single-leg or Twin-leg connector attaches to the 3M™ DBI-SALA® Nano-Lok™ directly to the harness Focusing on strengthening the worker's comfort and safety as the highest priorities, the 3M™ DBI-SALA® Nano-Lok™ Personal Self-Retracting Lifeline unites light-weight design with industrial-strength durability and function. The extremely compact and lightweight design is virtually unnoticeable on your back, staying out of the worker's way and making it ideal as a lanyard replacement. The Nano-Lok's smart activating brake system achieves fall clearance as low as 4ft.- providing more protection at low heights. In addition, tension is always kept on the lifeline, which reduces dragging, snapping and trip falls