Closed hand nut for quartz movements. AKA cap nut
Used to hold minute hand onto a quartz movement. This is a cap nut used when you are not using a second hand. It closes the tip of the movement so the second hand pin is covered. Most people use a cap nut when second hands are not used.
We include hardware when you buy quartz movements from us. You don't need to order them unless you want spares. If you order second hands we include an open minute hand nut. If you don't order second hands we include this cap nut.
(Legal disclosure: The dime is only for size comparison and is not included)