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This chain master link is for #420 chains. It allows the user to quickly release the chain on an outdoor garden tool without needing a chain tool. It can also be used to join two different chains together. A master chain link can become damaged, worn, or lost over time, and a replacement is necessary to keep the machine in proper working condition.Replacing a chain master link is quick and easy. It requires no tools. Wear gloves when repairing a chain master link. Allow the machine to cool completely before touching the chain or other components to prevent injury.This chain master link is a genuine OEM replacement part. It is made from heavy-duty, high-quality metal. It is sold individually. It is compatible with Yard Machine and MTD brand equipment. It can be installed on various edgers, lawn tractors, log splitters, snow blowers, trimmers, and other lawn and garden equipment.