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The Park Tool LRT-3 is designed and built to remove and install the direct mount lockring that retains front chainrings found on some Specialized, Cannondale and FSA modular cranks.Fits chainring of Specialized, Cannondale and FSAFor lockrings with 47 48mm outside diameter and 4 or 8 notchesFits both 4 notch (FSA and Cannondale) and 8 notch (Specialized) lockrings36mm hex drive to be used with Park Tool TWB-36 Crow Foot and a torque wrench to properly measure torqueConstructed of 4140 heat treated steel and plated for long life