The brush knots are knotted to 75% of the length. The brush is designed for brushing large areas and for heavy-duty brushwork, such as deburring, cleaning, derusting and descaling, as well as removing spatter. In order to fulfill the requirements for brushing stainless steel (INOX), PFERD produces all stainless steel (INOX) brushes using 302 stainless steel wire. Practical experience gained from industrial use confirms that this wire quality achieves excellent corrosion resistance with optimum brush life. The wire found in stainless steel (INOX) brushes tends to become magnetic after cold working. All PFERD brush products with stainless steel wire (INOX) are color-coded blue in the Tool Manual. All of these brushes are recommended for use on all stainless steels (INOX), such as 316.;The reason for this is a change in the microstructure caused by deformation (e.g. during the wire drawing process). This does not have any impact on the quality and corrosion resistance of the INOX filament. The filament is still resistant to corrosion. Stainless steel wire (INOX) is temperature-resistant up to 850 °F.