Spiral BakRing® is used to prevent extrusion of rubber O-Rings and rubber X-Rings. It consists as standard of two windings which in the ends are cut in an angle. It can be used for static as well as for dynamic applications. It should not be used for rotating applications. As it is “open” it can be installed at places where solid Back-up Rings are impossible to install. It adapts easily to big temperature changes.