The Bluebird 539000302 Aerator Sprocket W/Key Wheel supports proper power transfer within compatible aerator drive systems. This replacement sprocket and key wheel work with the drive mechanism to transfer rotation to the aerator components, helping maintain smooth and consistent movement during operation. It is suitable for replacing a worn, damaged, or faulty sprocket during mainten... https://www.wholetoolbox.com/bluebird-539000302-aerator-sprocket-w-key-wheel/539000302.html