Im changing my rotors on the back and need to know if anyone knows the size of that big a** bolt on the hub it looks like 35mm or so I just need to call around to places to see if they have the right size cause i dont have much time Gota go to work

Help is appreciated
Thanks

 

to take the back rotors off all you need to do is get an impact screw driver adn take the phillips screws off the rotor and knock the rotor off,.. no need to take the big nut off