The Simplicity 2177005SM Lawn Mower Pulley helps transfer power efficiently through the mower deck drive system for compatible Simplicity lawn mowers. It works by guiding and supporting the drive belt, ensuring smooth belt movement and consistent blade operation for dependable cutting performance. Made to replace a worn, cracked, or damaged pulley, it helps restore proper belt alignme... https://www.wholetoolbox.com/simplicity-2177005sm-lawn-mower-pulley/2177005SM.html