Sait-Lok surface conditioning discs are made of non-woven synthetic fiber coated with aluminum oxide grain. The all-metal Sait-Lok attachment ensures a secure fit to the backing pad (sold separately). Available in three grades: coarse (brown), medium (maroon), and very fine (blue). Used in a wide variety of applications such as cleaning, polishing, blending and deburring. Resists loading for long life without damage to or removal of base material. Used for stainless steel, ferrous and non-ferrous metals, wood, fiberglass, and gaskets. Package of 50.