Includes hook-and-loop backing for swift changes and replacements 9in Sanding discs (40 grit) For orbital and dual action sanders Works on wood, metal, and plastics Comes in 10-pack This product is used in conjunction with the Tooltech 120 Volt Electric Drywall Sander (sold separately). >> Get your drywall sander back in action with the Tooltechs (10) 9in Sanding Discs. They have been designed to work with Tooltechs 120-Volt Electric Drywall Sander (sold separately), or with any sander requiring 9in hook-and-loop sanding discs. These discs are available in a range of grit sizes from 40 to 220; ensuring you will have the right grit for the task at hand. The hook-and-loop backing allow for swift changes and replacements speedy up work site efficiency.