Features： 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 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 Freewheel Structure: Two Perine, Suitable For M35 x 1.25-30 Ring Teeth Fitment: For 412 Type Folding Bicycle Single Speed Refit Package List： 1 x Bicycle Freewheel 1 x Sleeve