SUNBELT BLADE-MOWER, 15-5/16", 5/8" - B1EM1817 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. (3) blades for 44" cut. Fits Lazer HP. Center Hole: 5/8" Length: 15-5/16" Thickness: .197 Type: Medium Lift Width: 2-1/2" This is an Aftermarket part. Thanks for looking!