Designed and built to remove and install Shimano direct mount chainring lockrings found on XTR 9120, XT 8120, MT900, and other Shimano direct mount systemsMachined flat face for optimal lockring engagement36mm hex drive to be used with Park Tool TWB-36 Crow Foot and a torque wrench to properly measure torqueFor lockrings with 41mm outside diameter with 16 notchesCNC`d 6061 aluminum constructionLockring ToolBlueLRT-4ShimanoUPC/EAN/GTIN: 763477006905