Replacement grade 8 blade bolt for Gravely Zero Turn mower decks, replaces code 05978900 and is 5/8" diameter by 1-3/4" long. Fits several models of Gravely mowers, check your parts manual of contact us to verify fitment on you particular mower Specifications: Length: 1-3/4" Diameter: 5/8" Grade: Grade 8 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 and free shipping! 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 back often. Replaces part numbers: 05978900 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.!