Blade-Mower, Xht, 21-3/16", 2-1/4" XHT (Xtreme Hardness & Toughness) blades feature a unique steel that incorporates boron, carbon, manganese, and other materials that ensure its strength. The blades are heat treated with the patented and independently tested Marbain heat-treating process. This process makes the blades 25% - 40% harder than standard lawnmower blades, making them the longest-lasting, safest, and most impact resistant lawnmower blades on the market.    Center Hole: 51/64"    Length: 21-3/16"    Replaces: Snapper: 1737816    Thickness: .156"    Width: 2-1/4" Snapper Riding Mower LT SERIES NXT19542 (2690846) NXT19542 (2690888) NXT2242 (2691023) NXT2242 (2691024) 150Z
