Features1Iron Material: Flywheel is made of iron material, which is oil resistant and has a long service life with reliable and durable performance. 2Durable Design: With its exquisite craftsmanship, the flywheel is durable and will not deform over time, maintaining its function and performance. 3Easy to Install: The flywheel with adapter is easy to install, convenient for professional bike mechanics and DIY enthusiasts. 4Enhanced Power Transmission: The 20mm flywheel adapter and 16T flywheel set is designed to provide stable and efficient power transmission to your modified electric tricycles, motorcycles, or go karts. 5Precise Sizing: The flywheel set features a 16 tooth design, providing precise engagement with the engine for optimal performance. Its compact size allows for easy integration into your existing system.SpecificationItem Type: Freewheel Adapter KitMaterial: IronPackage List1 x Freewheel Adapter1 x Freewheel