Park Tool LRT-3 Lockring Tool Description: Park Tool LRT-3 removes and installs 4 and 8 notch chainring lockrings. Fit Specialized Brose E-Bike motors, Cannondale, and FSA chainrings. Features: Remove and install the direct mount lockring chainrings found on some Specialized, Cannondale, and FSA modular cranks For lockrings with 47-48mm outside diameter and 4 or 8 notches 36mm hex drive can be used with Park Tool TWB-36 Crow Foot and a torque wrench to properly measure torque Compatiblity: Specialized Brose E-Bike Motor Specialized S-Works Cranks Cannondale Hollowgram Cranks Specific FSA Cranks