Product information Features: Size?Sanding discs roll lock 2” surface conditioning discs-Coarse/Medium/Fine 50pcs Material?Roll lock sanding discs are made of high-quality professional aluminum oxide Advantage: The coarse version is used in the surface treatment of metals; for example, the removal of roughing marks, light deburring or the removal of oxidation. Product Usage? They are made with surface conditioning material are suitable for a variety of tasks, due to their different degrees of fineness. Please choose the one that works best now Using Tips: The medium version is ideal for structuring and sanitizing on a variety of different materials. The very fine version creates a fine, decorative micro-section, especially on stainless steel and aluminum. Choose what you working with is the best thing