These wheels will not clog or glaze when working with aluminum or other non-ferrous metals. They are free of waxes and lubricants, so there is no need to clean the surface before welding or applying a surface coating, eliminating a time-consuming step in surface preparation. A long-life wheel excellent for deburring, grinding welds, beveling and shaping. For use with aluminum and non-ferrous metals. Package of 25.