The Ariens Company 21543736 Lawn Mower Fan Pulley Kit 4.5" x 1.625" supports smooth belt-driven operation by providing a properly sized pulley for compatible lawn mower systems. The pulley works with the mower belt to transfer rotational power between drive components, helping maintain consistent movement and efficient operation. Its correct dimensions support proper belt alignment an... https://www.wholetoolbox.com/ariens-company-21543736-lawn-mower-fan-pulley-kit-4-5-x1-625/21543736.html