These are to fit most German mechanical clock movements.
The hands are measured by the time track diameter (just outside the numerals, for example outside of the 9 to outside of the 6), the minute hand length will be about half this diameter. Comes also with the shorter hour hand included in the set.
The minute hand has a 2.2mm square mounting hole, the hour hand has a 4.5mm round hole.
Hand Fix to Chime Spot
Make the minute hand point to the right spot, when the clock chimed. This is easy, just take off the minute hand and bring it to your garage. When your in your garage with the minute hand take some pliers and turn the bushing that is inside the hand itself. Walk back to the clock and put the minute hand on and see if its now pointing closer to the quarters when chimes.