They are designed to thread over the point of the hook and up the shank and then slide neatly over the eye and Kwik Change Hook Swivel to hold securely in place. The tapered point ensures the set up is neat and the sleeve can be reused, allowing for quick hook changes with no need for shrink tubing.
The sleeve can be used to lock the swivel in place for a traditional style Ronnie rig or can be trimmed to leave the eye of the Kwik Change Hook Swivel exposed to increase movement.