The Rockgrab by Rock Exotica. Now available in a larger size for 13mm - 16mm ropes. Designed as a flipline/lanyard adjuster. It does a better job than most because of the orientation of the attachment point.
Part #: RG4-90
Rope Size: 13mm - 16mm
The Rockgrab large is our preference if you're needing a rope grab for larger diameter fliplines.