These heads are typically used in toolscopes or comparators and also custom fixtures. The spindle is non-rotating and carbide tipped. There is also a data output port that can be connected to a computer with optional equipment.
This unit is in good used condition, everything works as it should, smooth full travel. There is some staining on the spindle that does not affect function.
I have tried to capture it in one of the photos. The mount is 18mm dia.The item "Mitutoyo 164-164 Digital Micrometer Head 2 inch, used" is in sale since Friday, October 29, 2021. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Metalworking Inspection & Measurement\Micrometers". The seller is "gagingsales" and is located in Salt Lake City, Utah. This item can be shipped to United States.