Listing is for a buffer wheel, codes 304.011 (Old Code) or 304.018 (New Code) for a Cosmo Brand Fertilizer Spreader. This will also fit spreaders from Worksaver, Landpride, Tractor Supply, and many others. The buffer wheel mounts to the heavy duty upper agitator arm and rotates to pull the fertilizer down. Should not be used when spreading seeds. Disclaimer: Any and all Original Equipment Manufacturer's (OEM) tradenames, trademarks, drawings, colors, descriptive information and part numbers are used for parts identification purposes only, and DN Equipment, LLC (DN) is in no way implying that any specific parts are OEM parts. Further, any use of the OEM's tradenames, trademarks, drawings or part numbers by DN is designed only to aid DN's customers, in obtaining the proper DN part or component which will replace the OEM's part.