RUPP Marine Lok-Up Halyard Line Lock w/Bungee Double. Rupp Lok-Ups are compatible with a variety of halyard materials they provide a firm grip on 400lb/500lb monofilament 1/8" nylon rope paracord and Dacron. This patented design offers the ability to easily replace the internal locking components if needed. Beware of imitations Specifications for RUPP Marine Double Lok-Up Halyard Line Lock w/Bungee: Manufacturer: RUPP Marine Size: One Size Color: Black Package Contents: RUPP Marine Double Lok-Up Halyard Line Lock w/Bungee RUPP Marine CA-0157-2: Lok-Up Halyard Line Lock w/Bungee Double