This is a A-B1HS1004 BLADE-MOWER, XHT, 21", 5/8" PN: B1HS1004Main Description As Following : A-B1HS1004 BLADE-MOWER, XHT, 21", 5/8" P.N: B1HS1004 Replacement XHT Lawnmower blade. XHT(Xtreme Hardness & Toughness) blades are 25-40% harder than standard lawnmower blades. Benefits of the HXT blade are sharper and longer lasting cutting edges. More resistance to bending. Tighter tolerances in the aftermarket vs. OEM. XHT blades also offer greater impact toughness.(3) blades for 60" cut. Fits ZTR modelsCenter Hole: 21"Length: 21"Thickness: .197Type: Medium LiftWidth: 3" Crossed From: 10373 ROTARY , 350-671 STENS , 350671 STENS , 50-4208 WINDSOR , 504208 WINDSOR , 777391 EXCEL , 777391 HUSTLER , 782516 EXCEL , 782516 HUSTLER , 90-208 OREGON , 90208 OREGON , 91-811 OREGON , 91811 OREGON Found in Section & Models : Tractor Parts Associated Items : New Also This is An Aftermarket Product And : High Quality Afternaket Shipped from Both US and Canada