Diablo's premium 7-piece General Purpose Pack includes all the grits needed to complete your refinishing project. This project pack contains three 60-Grit, two 100-Grit, and two 150-Grit discs. These universal, 12-hole random orbital sanding (ROS) discs feature Hook & Lock™ backing and includes 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 grit-to-backing bond, ENDURA-BOND, provides Diablo's sanding discs with longer life and extreme durability.