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 XHT blades. Replaces the following OEM part numbers: This is the Predator commercial mulcher blades! JOHN DEERE: AM137333 GX22151 GY20850 AM137328 AM141033 AM141034 AM141032 AM137327 M154061 M154060 2 BLADES NEEDED ON 42" CUT MACHINES WITH 7 Star lobe center hole! Fits the following models 102, 115, 125, 135, D100, D110, D120D, D130,LA100, LA110, LA120, X110, X120, LA105, LA115, LA135 and Z225 Center Hole: 7 lobe" Width: 2-1/2" Thickness: .197" Length: 21-3/8" 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.