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.****This sale is for 2 replacement XHT Predator blades. Commercial mulching blades (2) blades needed for 42" cuts. All 42" decks are NOT the same. Please know what you need. Center Hole:27/32" Width: 2.1/4" Thickness: .250" Length: 21-1/4" 495100MURRAY 656252-853MURRAY 656252853MURRAY 92418E701MURRAY 92419E701MURRAY 95100E701MURRAY 95101E701MURRAY Â· Disclaimer: We list model numbers and part numbers for references only. At times the same model may take different parts based on serial number breaks or manufacturers specifications. We list all the specifications on the part (size, width, length, thickness, etc.) and YOU must know what is needed on YOUR application. We canÂt possibly make it more known as to what you are receiving when you purchase.