Hard Backing Pad for DCE800 Cordless Drywall Sander & DWE7800 Electric Drywall Sander. Hard foam design is ideal for removing larger material amounts in surface preparation and rough finishing applications. Perforated design optimizes dust collection efficiency. Hook and loop surface accepts common 9" diameter sandpaper and mesh. Integrated backing plate eliminates need for separate part. DeWALT 9" Hook-And-Loop Hard Backing Pad