ALEKO's premium 9 In, 240 Grit, 10 Hole Drywall Sandpaper Discs (8-7/8" diameter) with Hook and Lock backing include break-through innovations that improve performance, extend sanding life, and increase productivity. Our discs are specially designed for fast material removal and long standing life. The hook and lock backing enables repeated attachment and removal of discs for a consistent secure connection. ALEKO's sanding discs are the optimal choice for use in most Drywall sanders. Ideal for all types of wood, metal and plastics.