Sanding Drum, 2" x 3" x 1/2"

The description reads 2" x 3" x 1/2" and the picture looks as if it's 1/2" in diameter - which is what I was looking for. Unfortunately, the picture is of a much smaller size drum sander and the 1/2" indicates the arbor size for the drill. So I received a 2" diameter drum sander when I wanted a 1/2" drum sander. A bit disappointing. I don't know how it works since I won't have much need for it anytime soon.