Roller Fairleads is a device to guide a line, rope or cable around an object, out of the way or to stop it from moving laterally. Roller Fairleads can also be used to stop a straight run of line from vibrating or rubbing on another surface. An additional use on boats is to keep a loose end of line from sliding around the deck. Roller fairlead is mounted on the deck of the ship, guide rope device while docking use.