They make very smooth running rigs when used as a replacement to the swivels found on the top of leads. The second obvious use is for helicopter rigs. The large eye will rotate better if a large bead is used, whereas a smaller swivel would bump around the larger beads circumference. In other words, the large eye will slide effortlessly around it. They can also be used at the top of a link for the marker float - the large eye will allow the line to pull through that bit easier than a standard swivel.
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