Grizzly G8749 Drum/Flap Sander This sander is a great addition to the shop needing to shape and finish contours On one side choose between the included 3-1/4-Inch diameter or 4-3/4-Inch diameter inflatable sanding drums On the other is a 10-1/2-Inch diameter by 7-3/4-Inch long flap sander with twelve abrasive flaps backed up by flexible bristle brushes