REPLACEMENT XHT BLADES Extreme Hardness Toughness 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. By the way they are made in the USA! Predator blades offer superior mulching capabilities over traditional mulching blades. The airflow tooth design increases blade strength while producing more airflow for smaller clippings. Predator blades have all the same benefits as XHT (Xtreme Hardness & Toughness) blades Hands down the ABSOLUTE best aftermarket replacement blade on the market! Replaces the following OEM part numbers: John Deere AM30698 M41237 3 NEEDED ON 38" CUT Check your model to make sure they will fit. All 38" decks are not the same. Center Hole: 11/16" Width: 2-1/2" Thickness: .197" Length: 14" SHIPS UPS! SALES WITH PO BOXES LISTED ONLY FOR THE ADDRESS WILL BE CANCELLED.