Genuine Toro Blade Adapter used to secure the mower blade to the mandrel shaft. It's compatible with a variety of models.Model: 20199 (TimeMaster 30in Lawn Mower) Model: 20200 (TimeMaster 30in Lawn Mower) Model: 20975 (TimeMaster 76cm Lawn Mower) Model: 20976 (TimeMaster 76cm Lawn Mower) Model: 20977 (TimeMaster 76cm Lawn Mower) Model: 20978 (TimeMaster 76cm Lawn Mower) Model: 21199 (TimeMaster 30in Lawn Mower) Model: 21199HD (TimeMaster 30in Lawn Mower (Home Depot Rental)) Model: 21200 (TimeMaster 30in Lawn Mower) Model: 21810 (TimeMaster 76cm Lawn Mower) Model: 21811 (TimeMaster 76cm Lawn Mower) Model: 22200 (30in TurfMaster Walk-Behind Lawn Mower) Model: 22205TE (76cm TurfMaster Walk-Behind Lawn Mower) Model: 22207 (76cm TurfMaster Walk-Behind Lawn Mower) Model: 22210 (30in TurfMaster Walk-Behind Lawn Mower) Model: 22215 (30in TurfMaster HDX Walk-Behind Lawn Mower) Model: 22225 (30in TurfMaster HDX Walk-Behind Lawn Mower) Model: 22235 (30in TurfMaster HDX Walk-Behind Lawn Mower)