Parts and components for ovens, namely, protection tubes for high temperatures, protection tubes for thermocouples and probes, tubes for hot gas analysis and injection, heating elements from tube and wire, namely, elements made of alloys used in furnaces for heat treatment of machinery products, radiant tubes, coated protection tubes, burner tubes, muffle tubes used for indirect heating and heat treatment of wire and tubing, burner nozzles; electric and non-electric heating coils and retorts ...