Premium ceramic blend, a superior quality formulation designed for fast material removal and long sanding life. Universal hole pattern, a one-size-fits-all design (fits all 6 and 8 hole sanders) for fast and precise alignment. Premium hookand lock backing enables repeated attachment and removal of discs for a consistent secure connection. Clog-SHIELD, a proprietary blend of grinding agents, reduces pitch built-up and clogging. ENDURA-BOND, grit-to-backing bond, provides sanding discs with longer life and extreme durability. For orbital and dual action sanders in wood, metal, and plastics.