The IP-69K rated 3M DBI-SALA Sealed-Blok RSQ SRL is designed to work in the most demanding environments. This 3-Way retrieval self-retracting lifeline features a 50 foot stainless steel lifeline with a swivel snap hook. The 3M DBI-SALA Sealed-Blok Self-Retracting Lifeline (SRL) incorporates a patented concept that helps separate components, such as the motor spring and brake, from foreign elements such as grease, moisture, and dirt.