John Deere Original Equipment 3 Blades #TCU30317(3) OEM Part Numbers: TCU30317 / M144652 / M164016 Replaces OEM Part Number(s): Fits 54" Mower Decks For Z710A Z820A Z830A Z840A Z910A Z915B Z920A Z925A Z930M Z930R Ztrak Mowers Multi Pack Includes 3 TCU30317 John Deere lawn mower blades are manufactured with a combination of carbon and boron to provide hardness for a long life and sharp edge without breakage.