This spindle assembly is a genuine MTD part, sold individually. This spindle assembly can be used as a replacement part in a lawn mower. The purpose of the spindle assembly in a lawn mower is to provide a spot to which the blades of the appliance can affix and around which the blades can rotate while the appliance is in operation.The spindle assembly might have to be replaced at some point if the blades come loose from the component or that the component suffers damage that renders it beyond functionality. If the spindle assembly is chipped, cracked, dented, warped, punctured, or otherwise seriously damaged to the point that its function is reduced or negated, the spindle assembly should be removed and replaced by this genuine OEM replacement part before using the lawn mower again. It is a simple replacement process that will require only basic tools.This OEM part is a genuine replacement that is sold individually and sourced directly from the manufacturer. This spindle assembly is compatible with the following outdoor appliance brands: MTD, Craftsman, Toro, Troy-Bilt, Yard Machines, Huskee, Yard Man, and MasterCut.