Diablo's premium random orbital sanding (ROS) discs with Hook & Lock™ backing include 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'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. Premium ceramic grain blend is a superior quality formulation designed for fast material removal and long sanding life Premium Hook & Lock™ backing enables repeated attachment and removal of discs for a consistent secure connection Clog-SHIELD™, a proprietary blend of grinding agents that reduce pitch build-up and clogging For orbital and DA sanders in wood, metal, and plastics Recommended use - removing minor imperfections and initial sanding between paint/stain coats