Color Axle Nut 0.5 inch (12 mm) Red Compatible models: ■ Signus X [Type 1 - 4] ■ BWS-R ■ BWS125 ■Majesty S ■S-MAX ■ NSR50 etc. It will fit if the above axle nut is 0.5 inch (12 mm) 1.25 pitch.