These two USA-made replacement lawnmower blades are engineered for superior cutting performance and durability. Crafted from high-grade steel, they offer exceptional hardness and toughness, making them 25-40% harder than standard blades. This enhanced construction ensures sharper, longer-lasting cutting edges and increased resistance to bending. Designed for 42-inch cut decks, these blades are compatible with various Snapper riding mower models, including the LT Series, NXT19542, NXT2242, and 150Z. Each blade measures 21-3/16 inches in length, 2-1/4 inches in width, and has a thickness of .156 inches with a 51/61-inch center hole.