This versatile Dremel 442 Carbon Steel Brush Accessory Set includes two 13mm brushes, ideal for cleaning and removing rust from metal materials. They are also suitable for polishing metal surfaces, deburring and blending surface junctures, and cleaning electrical components. The brushes are made of stainless steel, which prevents "after rust" when used on corrosive-resistant materials like pewter, aluminum, and stainless steel. Each brush has a shank diameter of 3.2mm and comes in a pack of two.