Fits Shimano STEPS E6100, E7000, E8000 and E9000 e-bike motor systemsFor lockrings with 54mm outside diameter with 16 notchesReplacement for Shimano TL-FC39 tool36mm 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 lifeLockring ToolBlackLRT-2ShimanoUPC/EAN/GTIN: 763477006882