The Craftsman 583012MA Snow Blower Wheel Sprocket & Hub transfers drive power from the axle to the wheel for machine movement. This assembly mounts to the wheel and connects with the drive chain or axle mechanism. It works by engaging the sprocket with the drive system, allowing rotational force to turn the wheel and propel the snow blower. Replacing a worn or damaged sprocket and hub... https://www.wholetoolbox.com/craftsman-583012ma-snow-blower-wheel-sprocket-hub