This listing is for one replacement Toro ball bearing, replaces codes 10-9966. Measures 17mm X 407mm X 12mm and fits several mower spindles. Bearing specifications as follows: Outside dia.: 40mm Inside Dia.: 17mm Thickness: 12mm Sealed on both sides If you are not sure if these will fit your mower just send me an email with your model number and I will be happy to confirm them for you! One day handling! We have more lawn and garden items available than we have time to list them. If you don't see the parts you need listed please contact us we would love to earn your business. We are listing new items frequently so please check our store often. Part Numbers: 10-9966 We stock a wide variety of replacement parts for most Lawn and Garden and Agricultural Equipment please contact us if you have any questions or if you would like more information. . Your satisfaction is important to me, if you have any questions, concerns or comments please let me know, I will do everything I can to answer your questions, correct your problem and help you out.!