This is a DB21039 Vacumn Dual Sander. Dual action orbital sander 6" diameter pad, non-vacuum style. This hand sander has a 3/16" orbit, which is perfect for general sanding jobs. Available in both non-vacuum & central vacuum styles depending on your shop's setup. Features speed control that allows for thumb-control regulating. Also features perfectly balanced construction, which helps to reduce vibration & create a swirl-free finish, while the built-in muffling system reduces sound levels.