Shimano SM-HB20 Lock-ring for centre-lock brake rotors on thru-axle hubs 15/20mm
SHIMANO CENTERLOCK ROTOR LOCK RING. MANUFACTURER: SHIMANO. USES THE STANDARD SHIMANO BOTTOM BRACKET WRENCH TO TIGHTEN (HOLLOWTECH II, EXTERNAL STYLE). MADE FOR 15/20MM THRU AXLES, BUT WILL WORK FINE FOR QR AXLES AS WELL.