Multi-Application Trimmer Head / Trimmer HeadquartersPack Size:1NHC 207-3570, Oregon 55-095-1, Oregon 55-291, Oregon 55-095, Rotary 10192Universal Homelite, Ryobi, MTD and McCulloch Includes 5/16" right hand thread, 5/16" left hand thread and 1/4" right thread knobs