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Copperhead 21" mulching mower blade replaces John Deere M128485 on John Deere 7-Iron 60" cut deck. Order (3) mower blades for John Deere 60 inch deck. 15-10073. Fits F620, F680, F687, F735, M665, Z520A, Z720A, Z820A, Z830A, Z840A, Z850A, Z860A, Z920A, Z925M EFI, Z930M, Z930M EF!, Z930R, 2520, 4200, 4210, 4300, 4310, 4400, 4410, 667, 667A, 727, 757, 777, 797. 997. The teeth at the end of the blade ensure a quick shredding of grass clippings and debris.