This is a key to reset panic buttons used in burglar/security alarms.
It's smaller than the FP2 key used to reset fire alarm devices.
The size of the key is scaled from measurements of a manufacturer key. (Example from retailer: Panic Button CQR Reset Key Access Control & Automatic Door Equipment (jwsltd.co.uk))
This is a remix of an FP2 key model made by Sagittario on Thingiverse (Attribution 4.0 International (CC BY 4.0))
The author remixed this model.
Scaling to fit use and flat version