Driver clutch bore: 3/4″(19mm),Driven unit: Overall Diameter 6″ (5/8″ driven pulley) ,Sprocket teeth: 10 teeth #40/41 chain. This is a complete kit that includes both drive and driven clutch pulleys, belt, aluminum engine mount plate, built in jackshaft with sprocket, all mounting hardware. Made of high quality iron and aluminum material, which is sturdy, durable, maximum torque, wear-resisting and fast heat disation 30-75 Unit replaces:Comet 218353A, 219552A, 219456A, 217610A, and 203814A TAV2 30-75 Comet Torque Converter 30 Series small engine belt drive pulley clutch kit will help with more take off power, smoother acceleration, climbing ability, and top end speed by providing more torque in the low end and higher speeds in top end. Comet Torque Converter kits are used in small vehicles, riding lawnmowers, small tractors, go karts, mini bikes, mini choppers, ATV, motorcycles, and waterski winches Engine compatability: Bullet Lines Torque Converter is compatible on