The 3M Dbi-Sala Nano-Lok Personal Self-Retracting Twin-Leg 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 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. 6 Ft. (1.8M) Twin-Leg Lifelines With 3/4″ (19Mm) Dyneema Fiber And Polyester Web And Steel Rebar Hooks, Quick Connector For Harness Mounting.,