This listing is for one aftermarket replacement 30mm (1.181") Flanged Castle Nut for Rotary Cutter Gearboxes. OEM replacement castle nut fits many Comer, comaptibible with ALAMO and RHINO AG gearboxes with the 30mm threaded output shafts. These flange nuts have are 30mm x 2.0 thread with a 6mm flanged washer. Please note some mowers used these larger 30mm nuts while many also use a 1" or 24mm castle nut, please measure your shaft for prop[er nut fitment before ordering. 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:00771226 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.