D621202794 / 1202794 LIFELINE with Snap Hook, 50ft for use with the hands-free mobile type Lad-Saf® Rope Grab (D625000335 sold separately) is for use on a 5/8" lifeline and automatically follows the user. The user-friendly design eliminates nuisance lock-ups. It utilizes both inertia and cam locking systems for added safety, and it's detachable for greater flexibility.