Compatible with Murray lawn mowers, replace part numbers 91179, 410409, 421409, 21409, and 91179MA for direct replacement. Pulley measures 85mm outer diameter, 17mm inner bore, and 27mm width, providing precise fit and proper belt tension. Helps maintain correct belt alignment to ensure smooth mower operation and reduce strain on engine and transmission. Built with quality materials and sealed bearings for durability under tough outdoor mowing conditions and vibrations. Ideal replacement pulley for restoring mower performance and preventing premature belt wear or slippage during operation., Manufacturer: YINETTECH