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 42" Cut. Side Discharge.     Center Hole: 7 Lobe     Length: 21-1/4"     Thickness: .197     Width: 2-3/4"
