DBI/Sala Rope Vertical Lifelines with Snap Hook are made of 5/8" or 3/4" polyester/polypropylene blend rope for strength and durability. A complete range of lifelines for use with DBI/Sala rope grabs come in 30, 50, 75 and 100 foot standard lengths as well as custom lengths. A self-locking snap hook at one end makes for easy connection to the anchorage. To keep the lifeline taut and optimize performance of the rope grab system, several styles of counterweights are available. Meets or exceeds all applicable industry standards including OSHA, ANSI and the stringent ANSI Z 359.