Centrifugal clutch: 3/4″ bore centrifugal clutch Pulley Drive with a 3/16 inch key way for engines up to 6.5hp. High quality and professional clutch: Made of Quality Iron Material, Which is Lightweight, Portable, Sturdy, Durable, Maximum Torque, Wear-resisting and Fast Heat Disation. Package included: 1*Centrifugal Clutch Commonly use: Carter Go Karts (Some) and Mini Bikes, Wood Chippers etc Product Description Description: 100% brand new and high-quality drive belt. Color: Black. Material: Iron Material Clutch Bore Size: 3/4″ Key Way: 3/16″ Compatible Belt: 1/2″ AB Style Belt Compatible with :Carter Go Karts Mini Bikes Wood Chippers engines Up to 6.5HP. Package Includes: 1X Centrifugal Clutch Pulley Drive Professional Installation is Highly Recommended No Instruction Included Please be sure to compare carefully with photos and check part number before buying items