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Used to replace electric bike hub motor nuts, usually for 250W-500W motors with 12mm shaft. The motor screws are made of steel and rubber materials, which are very durable. E-Bike hub motor screw nut fit for most bicycle replecement, electric bike, scooter, e-bike, etc. They can also be used as axle spacers in conjunction with torque arms on more powerful motors. Please carefully confirm the thread size before purchasing.