Durable Material: The freewheel is made of durable and sturdy material, high strength and wear resistant, providing long service life. Improved Performance: The sprocket provides fast riding speed and saves effort, with smooth turning action and low noise operation. Precise Thread Processing: The cog freewheel features precise thread processing technology, ensuring a secure connection with the bicycle hub and smooth performance. Ideal Replacement: This single-speed freewheel is designed for bike repair and refit, allowing direct replacement of old or damaged parts to maintain normal bike function. Easy to Install: The chain freewheel is simple to install, convenient and time-saving, requiring no special 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