Black serpentine hands for Hermle mechanical movements & others have square mounting holes. The minute hand is 2-3/4" as measured from the center of the mounting hole to the tip. With 2.0mm square minute hand bushings & 4.5mm round hour hand bushings.
Hands for Mechanical Movements|Hour & Minute Hand Sets for Mechanical Movements|Serpentine Style Hand Sets|Hands & Related|Clock Repair & Replacement Parts