The spanner was created to tighten or loosen a 32mm diameter retaining ring on a beer tap.
I used an M4 x 6mm screw for the spanner tooth that fits in the beer taps retaining ring.
Although the hole that takes the screw has a thread I suggest that you run an M4 tap down it to recut the threads to make an easy fit when inserting the screw.
Printer:
Ender 3
Rafts:
No
Supports:
No
Resolution:
0.4
Infill:
100%
Filament: Any PLA