Good point Frank, they are reversable one way they underdrive, the other way they overdrive. If I had one here I'd count the turns.
The reason I know how tough they are, when I was an apprentice a 2 9/16" auger bit caught a knot hole, kicked back, hit me on the jaw, knocked me off the ladder, I held on to it and when I hit the floor it was still running, caught my pants and chewed a hole in my leg. No permanent damage thank goodness.