This listing is for one replacement 30mm (1.181") Castle Nut for Comer Gearboxes. OEM replacement castle nut fits many Comer gearboxes with the 30mm threaded output shafts. Comer typically has used two different castle nuts, one being 25mm or just under an inch and a larger one that is about 1-3/16" (30mm), this is the larger one. We sell many mower parts at very competitive pricing. 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 Number:8.2.2.00555 We stock a wide variety of replacement parts for Agricultural Equipment please contact us if you have any questions or if you would like more information.