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!****This sale is for 2 replacement USA XHT blades. Replaces the following OEM part numbers: MURRAY 95100E701 95100E701MA 495100 4951003 4951003MA Center Hole: 27/32" Width: 2-1/4" Thickness: .134" Length: 21-3/16" 2 NEEDED ON 42" CUT 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.