Diablo premium 7-piece refinishing project pack includes all grits needed to complete your refinishing project: three 80 grit, two 150 grit and two 220 grit discs. These universal, 12-hole random orbital sanding (ROS) discs feature hook-and-lock backing and includes breakthrough 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 own blend of grinding agents, reduces loading thus maximizing productivity. The great grit-to-backing bond, Endura-Bond, provides Diablo sanding discs with longer life and extreme durability.