The 3M™ Vacuum Bag Cover holds and protects the 3M™ Vacuum Bag Insert, a paper bag that collects dust created by sanding.
When dust collects on the abrasive surface, there forms a layer between the work surface and the abrasive and fills the air you breathe. When you collect and evacuate the dust, you get better finishes, get longer abrasive life, and breathe cleaner air.