For wire line fishing rods, Large diameter roller relieves line stress over rod end and increases wire line life and strength, Swivel action saves rod guides and unnecessary rod stress, All stainless steel construction, Stainless steel ball bearing roller, Rod swivel barrel allows for 270 degree rotation, Swivel top can not rotate leaving line twisted, Stops on line guide swivel helps prevent line kinks, Available in sizes to fit most fishing rods, Easy assembly and installation, Recessed roller eliminates wire binding