Nano-Lok™ Extended Length Self Retracting Lifeline, 20', Dyneema®, SwivelImpact resistant housing made of tough thermoplastic housing designed to help withstand demanding worksites Speed sensing brake system provides as low as 6 ft. (2m) of required fall clearance Swiveling anchorage loop limits lifeline twisting for smooth operation Dyneema fibre and polyester web lifeline reduces overall weight and the retractable design helps provide freedom of movement Durable nitrile energy absorber is a smaller design and last four