This is a die and spacer set for trimming a radial capacitor.
The die is a hardened steel plate. The included one has an array of holes on a 0.1" x 0.1" spacing. The hardened die goes next to the trimmer blade.
The spacer is printed in ESD material. Polymaker PETG ESD in this case.
This spacer was about a 10 minute print.
The author marked this model as their own original creation.