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There are a few features in the horizontal or Vertical direction movement. That is, the EMT can have 2 or more movements in it simultaneously at all directions.
The reciprocal of the waggle rod shaft diameter is 2.90mm 0.01mm. The TPC (Thread Per Centimeter) is 22.5
The reciprocal of the key shaft diameter is 3.40mm 0.01mm. The TPC (Thread Per Centimeter) is 16.25

If you want to order the horizontal or vertical movement, the price is the same.
These are part of the attachment accessories of wind-up music boxes which all are compatible with the EMT. They are shown in the following pictures.

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