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. (2) blades for 36" cut. (3) blades for 52" cut. Wide area walk-behind. OEM Cross Reference 3405 345-462 56-2390 94-022 56-2390-03 Fits models : Toro Wheel Horse : SEVERAL (36" & 52")