This is the rear axle nut you will need to remove the rear wheel.
It's impact grade and made out of steel.
I learned the hard way after stripping the aluminum one
Fits: 1098,1198,Streetfighter,Multistrada 1200,MV Agusta (per SpeedyMoto, please check to make sure for your application)
SpeedyMoto - Wheel Nut Socket Tool