Shimano DX Serrated Ring.
Shimano DX serrated gear ring (3.5mm)
.
mounted as last spacer on the cassette body and then secured with a HG Lockring.
the serrated ring will ensure the HG lockring.
Shimano Europe B.V.
High Tech Campus 92
5656 AG, Eindhoven
The Netherlands
https://bike.shimano.com/de-DE/home.html
