Ensure the longevity of your mountain bike cranks with the PRO Crank Protector. The thermoplastic rubber sleeve slots over Shimano MTB crank ends, is held in place by the pedal spindle, and provides physical protection against rock and tree stump strikes which could otherwise damage the crank ends. Includes two crank boot protectors Compatibility: Shimano Crank Boots / Protectors are compatible with the following: SLX M7100 series : FC-M7100, FC-M7120, FC-M7130 Deore XT M8000 series: FC-M8000, FC-M8050 Deore XT M8100 series : FC-M8100, FC-M8120, FC-M8130 XTR M9100 Series : FC-M9100, FC-M9120, FC-M9125, FC-M9130