Park Tool LRT-4 Shimano Direct Mount Lockring Tool Description: The Park Tool LRT-4 is a precisely CNC machined aluminum chainring tool that removes and installs lockings found on many Shimano direct mount crank systems. The 36mm hex fitting accepts the Park Tool TWB-36 (sold separately) or crescent wrench in order to achieve proper torque. Features: Designed and built to remove and install Shimano direct mount chainring lockrings 36mm hex drive can be used with Park Tool TWB-36 Crow Foot and a torque wrench to properly measure torque Machined 6061 aluminum to the high standards Park is known Fits lockrings with a 41mm outside diameter and 16 notches Compatibility: Shimano XTR 9120 Shimano XT 8120 Shimano MT 900 Other Shimano Direct Mount Systems