BN Products BNR1841 dustless drywall sander is designed for sanding walls and ceilings made of drywall or plaster in any position. The tool has a convertible head that can be switched from round orbital to a triangle shaped oscillating sanding head that is great for corner and edge work. Just use the built-in extensions to change the length of the tool from 3.6 ft. to 5.4 ft. long.