Things includes : Principal Shaft Joint-1pc M4*2.5*12 Screw Shaft-1pc Metal Cap Head Screw 3*12-1pc Iron O-ring -1pc handbook volume: AX31034+AX31221+AX31222 Product major function & use:
Ahead energy through motor to rear gearbox. Manufactured by harden metal #45, better and durable to acquire extra smooth performance.