The blades are heat treated with a process, Web Notes: makes the blades 25% - 40% harder than standard lawnmower blades, making them the longest-lasting,, Web Notes: safest, and most impact resistant lawnmower blades on the market.
5" x1" Blade-Mower, XHT, 18", 2-1/2, Replaces: Exmark: 103-6382, Center Hole: 15/16", Length: 18", Thickness: .197", Width: 2-1/2", Type: Medium Lift, Web Notes: XHT (Xtreme Hardness & Toughness) blades feature a unique steel that incorporates boron, carbon,, Web Notes: manganese, and other materials that ensure its strength.Blade-Mower, XHT, 18", 2-1/2 17..