The BNR-1839 drywall sander is designed for sanding walls and ceilings made of drywall or plaster in any position. The convertible head can be switched from round orbital to a triangle shaped oscillating sanding head which is great for sanding corners and edges. With the built in extensions you can change the length of the drywall sander from 3.6 ft. to 5.4 ft. long. The removable brush segment allows sanding right up to the edge. With the center and edge vacuum locations a large area of dust collection is provided and can be hooked up to a standard vacuum hose. When properly used with a HEPA system this combination ensures a dust free work environment. This Drywall Sander can be folded in half to fit into a carrying case.