Diablo's premium 5 in 120 grit universal, 12-hole random orbital sanding (ROS) discs with hook-and-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 great grain bonding system, Endura-Bond™, provides Diablo's sanding discs with longer life and extreme durability.