Diablo's premium 5 in. 320-Grit (Super Fine) random orbital sanding (ROS) discs with StickFast™ 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.