OVERVIEW: SAIT 71239 More flaps that are larger yield longer life, made with premium zirconium abrasive material that provide long-life and high stock removal. Grind, blend and finish with one product, Out performs competitive low density flap discs. Resists loading on aluminum - unique in the industry. KEY FEATURES: Made with premium zirconium grain Regular density, long life Will not contaminate stainless steel