Features1IRON MATERIAL: The freewheel is made of iron material, which is oil resistant, long lasting and reliable and durable. It can withstand long time use and high strength riding, not easy to be damaged and keep its good function and performance. 2 CRAFTSMANSHIP: Made through exquisite craftsmanship, the freewheel is durable and won't deform over time, providing you with a smooth and reliable using experience. 3EASY INSTALLATION: The freewheel comes with an adapter that makes installation easier and more convenient for professional bike mechanics and DIY enthusiasts. 4GEAR SELECTION: The set contains two kinds of freewheels, 22 teeth and 24 teeth, which can meet different installation needs, you can choose according to your needs. 5MODIFICATION KIT: Whether you want to upgrade the performance of your original bike or make customized modifications, this kit can meet your needs.SpecificationItem Type: Bike Freewheel Drive Adapter SetMaterial: IronWeight: Approx. 773g / 27.3ozPackage List2 xFreewheelAdapter2 xFreewheel