Feature: 1. Durable Material: The freewheel is made of durable and sturdy material, high strength and wear resistant, having a long service time. 2. Improved Performance: The sprocket can not only provide fast riding speed, also saves effort, having smooth turning action, operating without too much noise. 3. Precise Thread Processing: The cog freewheel has the precise thread processing technology, ensuring close connection with bicycle drum and having smooth operation. 4. Ideal Replacement: The single speed freewheel is a perfect replacement for bike repairing and refit, can directly replace the old and broken accessory, ensuring the normal operation of your bike. 5. Easy to Install: The chain freewheel has a simple installation, convenient and time saving, don't need too much tools or complicated steps. Specification: Item Type: Bicycle FreewheelStructure: Two Perine, Suitable For M35 x 1.25-30 Ring TeethFitment: For 412 Type Folding Bicycle Single Speed Refit. Package List: 1 x Bicycle Freewheel1 x Sleeve