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XHT 16-5/8" Mower Blade (Set of 3) - B1KU1028,3 Tines and Fingers John Deere Original Equipment HubXHT 16 5 8" Mower Blade (Set of 3) B1KU1028,3 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