THREE MAJOR USES: Firstly they make very smooth running rigs when used as a replacement to the swivels found on the top of our leads. They were originally designed to only be found as part of the running rig kits, which can be found in the Lead Systems section of the site. But after too many enquiries to mention we had to add them to the range. The second obvious use is for helicopter rigs, the large eye will rotate better if a large bead is used, a smaller swivel will bump around the larger beads circumference where the large eye will slide effortlessly around it. They can also be used as 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. No doubt you will find other uses we have not even thought of yet. pack of 10