ALEKO's premium 9-Inch, 240 Grit, 6 Hole Drywall Sanding Disc includes break-through innovations that improve performance, extend sanding life and increase productivity. Meticulously designed for fast material removal and long standing life. Hook and lock backing enables repeated attachment and removal of discs for a consistent secure connection. Optimal choice for use in DP-3000 Drywall sanders. Ideal for all types of wood, metal and plastics.