This item is an genuine Toro OEM pinion gear. This pinion gear is intended to be used with walk-behind lawnmowers on Toro and Lawn Boy mowers. The metal pinion gear attaches the mower’s transaxle and is used to interconnect with the wheel’s gear to rotate the drive wheel. Fits Models: 10641 (20in Mulching/Rear Bagging Lawn Mower), 10641C (20in Mulching/Rear Bagging Lawn Mower), 10642 (20in Mulching/Rear Bagging Lawn Mower), 10642C (20in Mulching/Rear Bagging Lawn Mower), 10644C (20in Mulching/Rear Bagging Lawn Mower), 10646 (20in Mulching/Rear Bagging Lawn Mower), 10647 (20in Mulching/Rear Bagging Lawn Mower), 10662 (Insight Lawn Mower), 10665 (Insight Lawn Mower), 10665C (Insight Lawn Mower), 10666 (Insight Lawn Mower), 10666C (Insight Lawn Mower), 10672 (Insight Gold Lawn Mower), 10673 (Insight Gold Lawn Mower), 10682 (Insight Lawn Mower), 10684C (Insight Lawn Mower), 10685 (Insight Lawn Mower), 10739 (21in Mulching/Rear Bagging Lawn Mower), 10765 (Insight Platinum Lawn Mower), 10780 (Insight Platinum Lawn Mower), 10785 (Insight Platinum Lawn Mower), 10795 (Insight Platinum Lawn Mower), 10796 (Insight Platinum Lawn Mower), 10797 (Insight Platinum Lawn Mower), 10996 (Insight Lawn Mower), 10998 (Insight Lawn Mower), 17739 (21in Mulching/Rear Bagging Lawn Mower), 20192 (Super Bagger Lawn Mower), 20194 (Super Bagger Lawn Mower), 20197 (Super Bagger Lawn Mower), 20199 (TimeMaster 30in Lawn Mower), 20200 (TimeMaster 30in Lawn Mower), 20332 (22in Recycler Lawn Mower), 20332C (22in Recycler Lawn Mower), 20333 (22in Recycler Lawn Mower), 20334 (22in Recycler Lawn Mower), 20337 (22in Recycler Lawn Mower), 20337HD (22in Recycler Lawn Mower), 20338 (22in Recycler Lawn Mower), 20340 (22in Recycler Lawn Mower with SmartStow), 20349 (21in Recycler Lawn Mower), 20353 (22in Recycler Lawn Mower), 20355 (22in Recycler Lawn Mower with SmartStow), 20357 (22in Recycler Lawn Mower), 20363 (Flex-Force Power System 60V MAX 22in Recycler Lawn Mower), 20363T (Flex-Force Power System 60V MAX