Shimano Sm-HB20 Bike Centerlock Lockring For 15 20MM Thru-Axle Hub Use
Generally suitable for Shimano 15 mm and 20 mm front thru-axle hubs aluminium. -For hubs with thru axle 15mm and 20mm. Material: Aluminium. This lock ring is required to attach a center-lock brake disc to the corresponding hub with 15 or 20 mm thru axle.