These axles are for use with assembly type universal shafts. Axle rings give more secure assembly than standard grub screw attachment.Includes two each of wheel axles and axle rings.Compatible ChassisTT-02*1, TT-02D*1, TT-01 Type-E*1, TT-01 Type-ES*1, TT-01D Type-E*1, M-05*2, M-05 PRO*2, M-05 Ver.II PRO*2, M-06*2, M-06 PRO*2, MF-01X*2 and DF-03*3 Chassis1: Use with Item 53792.2: Use with Item 53597.3: Use with Item 53791.