The MTD 918-04197B Spindle Assembly 5.75"-Pulley supports the rotation of the mower blade on compatible lawn mower decks. This assembly connects the blade to the deck’s drive system, allowing power from the belt and pulley to rotate the blade during mowing. Featuring a 5.75-inch pulley, it is designed for compatible MTD equipment and can replace an original spindle assembly that is wo... https://www.wholetoolbox.com/mtd-918-04197b-spindle-assembly-5-75-pulley/918-04197B.html