This Crank is a #7/4.00mm. It will work on your Howard Miller, Ridgeway, Sligh, Trend, Pearl, Colonial, Seth Thomas, and more. If your clock has a Hermle, Kieninger, Jauch, or Urgos movement in it this key will fit. This key is Swiss scale. This is the same size and style as our other crank winder except the handle is Unfinished. Check out our key size chart....