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Compatible with Shimano GRX cranks, including RX600 and RX810 Drop-Stop ST is designed only for Shimano Hyperglide+ and KMC 12-speed chains Wolf Tooth Patented wide/narrow tooth Drop-Stop profile provides maximum chain retention and mud shedding ability Designed for 50mm chains (same as Shimano GRX chains) CNC machined with high quality 7075-T6 aluminum for exceptional strength and weight savings