For grinding steel aluminum oxide mesh is most commonly used. Currently on the market the most commonly used in industrial mechanical processing of metal are belts, flap wheels, grinding wheels, fibre discs and flap discs. Belts works on specialized grinders tailored to strictly defined technology. Therefore, it is extremely important in the proces of cutting to adjust to recommended speeds which depends on type of material. Fibre discs fitted on angle grinders require additional selection of appropriate support pads. Grinding the metal surface leads to its alignment and cleaning. Wels steams, scratches, roughness and paint coatings are removed. Such proces is also used to remove corrosion centres.