Essential to the proper mounting of metal mudguards, they are also useful for racks and other accessories.
Use one or two of the washers between the mudguard and the fork crown, the seat stay bridge, the chain stay bridge and between the mudguard and racks mounted to the mudguard. They are intended to dampen vibration, lessen the likelihood of stress cracks and reduce noise from pebbles and twigs bouncing into the mudguards.
The price is for a pack of six, colors may vary. OD is 12mm; ID is 5mm.