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MTD Edger Blade 781-0080-0637$8.75
This is a genuine OEM sourced replacement part designed for use with trimmers/edgers. It is great for edging level ground around sidewalks and driveways. This blade is made out of metal and it is sold individually.
To replace it you would need a wrench to remove the blade nut. This Blade is used in Edgers, and Trimmers.