Sanding by hand often turns what should have been a crisp edge into one that's rounded and uneven. The 12x18" platform supports the piece while you guide it against sandpaper attached to a fence. Three slots in the fence let you slide it up and down to expose fresh sandpaper as needed. Coarse paper is mounted on one side of the fence; the other side has finer paper. Sawdust falls into the space between the fence and platform.