2 Key Set of Hermle, Hamilton, Ridgeway, Howard Miller, Seth Thomas, Clock Winding Key #7/4.00mm and #3/3.00mm This is a German made unused Hermle Trademark clock key The #7/4.00mm key is for mantle or wall clocks that have hermle series 141,150, 151, 340, 341, 350, 351, 1050, 1051 movements in them The #3/3.00mm key will fit all Hermle series movements #130, 131, 132. This two pack is perfect if you have a Hermle movement but are not sure which size is right for you.