Welcome to this listing from awf-restorations
Good Quality brass double ended key NO 18
The size of the small end is 1.75 mm square hole with a 5 mm shaft.
The larger end is 6.75 mm square hole.
Other sizes are available.
Thanks for looking, please take a look at some of the other products we have in our eBay store including high quality reproduction hands, cleaner and many clock tools/resources for horological repairs.
We also provide a restoration service for both clock cases and movements.
Please message for further details.