This flywheel is an authentic OEM replacement part sourced directly from the manufacturer. It is part of the starter assembly on trimmers and other small engines that use a pull-start system. If the engine is misfiring, overheating, or not starting, the flywheel should be checked and replaced if necessary. Normal wear and tear can lead to the breakdown of the flywheel. The flywheel is located behind the recoil starter assembly and is attached to the engine. When the starter cord is pulled, the flywheel spins to start the engine. If the flywheel is damaged and doesn't spin fully or is seized and won't spin at all, it should be replaced. A Phillips screwdriver, spark plug wrench, Torx wrench, long-nosed pliers, and a rubber hammer are needed to complete this project. A bowl or other receptacle for storing drained fuel and work gloves are also suggested. Make sure the engine is cool, and the spark plug is removed before making this repair.This flywheel is a solid metal part that is sold individually. This flywheel is designed for tillers, cultivators, and other small engines manufactured by Craftsman and Troy-Bilt.