N2015 : Outside Diameter - 30mm, Size Wrench - 26mm, with M20x1.5mm, thickness is 6mm. Fitting as follow

1. Suspension : RCG-2020S-3M5, RCG-2030S-3M5, RCG-2040S-M5G8, RCG-2050S-2G8, NCG-2020S-3M5, NCG-2030S-3M5, NCG-2040S-M5G8, NCG-2050S-2G8