Rotary 12121 PK6 Copperhead Mulching Blades 6 Made In USA Heavy Duty Mulching Replacement Blades for 54" Decks. Better Mulching Performance than FSP blades Quality Rotary made blades, Heat Hardened Steel 18-1/2" Long, 3" Wide, .187" Thick, 5-Point Star Mounting Hole Also for Husqvarna 532187254, 532187255, 532187256