This product includes : Main 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 & usage:
Transmit power through the motor to rear gearbox. Made by harden steel #45, more powerful and durable to accomplish more smooth performance.
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