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M12x1.25 Fuji 17mm driven Locking Flange Nut

FUJI Locking nut - intended for Honda Grom, Monkey, and Dax axles. The main difference between these and OEM is the 17mm driver that these accept, which allows you to run a wider variety of spools, axle sliders that will not accept a 19mm socket. 

FUJI is the manufacturer of the OEM nut used on the swingarm, and axles for the Grom, Monkey and DAX.