This is Race Face's new Direct Mount Single chainring. It s been designed and machined in Race Face s Vancouver, BC facility and tested on the North Shore and in the Whistler Bike Park. Compatible with RaceFace Cinch Cranksets, the Direct Mount Chainring offers super chain retention and runs super smoothly for a quiet ride.Narrow Wide tooth profiling ensures ultimate chain retentionAttaches as part of the RF Cinch system (using common Park BBT-22 bottom bracket tool) - allowing to switch between DM rings/spiders with easeUtilizes RF proprietary spline design7075-T6 aluminium aerospace grade strengthStiff 4mm plate thickness to transfer loads without flexing