Race Face's Cinch Narrow/Wide chainring for Shimano 12-speed drivetrains has the versatility of RF CINCH integration and the stiffness to turn all your "push" into straight up "go". It's proprietary direct mount spline interface is designed to be used with any of Race Face's Cinch cranksets. The chainring attaches using a lockring that can be installed/removed with a Park BBT-22 bottom bracket tool ( ISIS BB tool) . The narrow/wide tooth profiling ensures ultimate chain retention with 12 speed Hyperglide+ chains.