Allow room for the whole plate
Check the 75 mm circular footprint against neighbouring controls, enclosure edges and any existing labels. The 23 mm measurement is the hole in this backing plate; it does not specify the panel cut-out required by a particular actuator. Use the actuator installation drawing for that dimension.
Specify the complete emergency-stop assembly separately
This item is a plastic identification plate. It does not provide electrical contacts, a latching mechanism or a safety-control function. If you are building a complete operating station, select the actuator, holder and contact modules for the actual circuit as separate components. No individual actuator combination is claimed by this listing.