Shimano HB-M8010 Lock Ring & WasherThe Shimano HB-M8010 Lock Ring & Washer is used to attach Shimano Centerlock disc rotors. It is compatible with hubs that have a 15 or 20 mm thru-axle.FeaturesShimano Disc Brake Rotor Small PartsTighten to 40 NmShimano Part Number: Y2A598030 | Shimano HB-M8010 Lock Ring & Washer Black