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 Chassis TT-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 Chassis 1: Use with Item 53792. 2: Use with Item 53597. 3: Use with Item 53791.