MODERN Grandfather Clock Crank Key Winder Mainspring - Key Size No. (5) - Grandfather Clock Crank Winder Key - THIS LISTING IS FOR ONLY 1 KEY AS NUMBER MENTIONED IN THIS LISTING - BRASS KEY WITH WOODEN KNOB - 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. If you have any questions feel free to message me. - An Unique Product from Brass Blessing