Technical data:
2 cap nuts with washers.
For hub dynamo with roller brakes / disc brakes.
Washer
Shimano washer.
Outer diameter: 17.5 mm
Inner diameter: 9 mm
Wall thickness: 4.5 mm
Thickness: 2 mm
Self-pulling.
Acorn nut.
Cap nut M9.
Number: Y-31414210
For Shimano Nexus Inter-L hub dynamo HBNNX32.