B0535 M3 nut (opposite side 5.5mm) : Optimum to the damper removal and re-installation of MBX5R and MBX-5T etc
B0536 M4 nut (opposite side 7.0mm) : Optimum to wheel removal and re-installation of the touring car of MTX4R and the like
* As for the advanced part the coating whose durability is high is administered.
* As for grip because of duralmin make super light weight.
Source : Mugen Seiki