This product includes : Principal Shaft Joint-1pc M4*2.5*12 Screw Shaft-1pc Metal Cap Head Screw 3*12-1pc Iron O-ring -1pc Manual quantity: AX31034+AX31221+AX31222 Product major function & use:
Send energy from the motor to rear gearbox. Produced by harden metal #45, stronger and durable to obtain more smooth performance.
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