When sanding a floor, you need a floor sander, but if stairs are involved, you'll also need an edge sander. Both sanders are necessary to produce good results.
More in Home Improvement
At the base of an edge sander is a replaceable sanding disc that rotates at high speed.
11 Wooden Staircases for Branching Out 11 Photos
How to Install Doorway Molding 8 Photos
© 2014 Scripps Networks, LLC. All Rights Reserved.