Diablo's premium 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 and offer extra-long sanding life than other sanding discs. 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.