Diablo's premium 5" 40-Grit universal random orbital sanding (ROS) discs with Hook & Lock™ backing include break-through innovations that improve performance, extend sanding life and increase productivity. Featuring a premium ceramic blend, these discs remove material faster than other sanding discs and offer an extra-long sanding life. Clog-SHIELD™, Diablo's own blend of grinding agents, reduces loading thus maximizing productivity. The superior grain bonding system, ENDURA-BOND™, provides Diablo's sanding discs with longer life and extreme durability.