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 46" cut. Fits Scotts 2046 and Sabre 1646, 1846HV. OEM Cross Reference M127466 330-356 91-448 M127466 Fits models:John Deere : SEVERAL (46") John Deere RIDING MOWER: F510 (46" or 47") John Deere RIDING MOWER: F525 (46" or 47")