SET OF 4 - SUNBELT BLADE-MOWER, 19-3/8", 3/8" - B1EP1003 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. (2) blades for 38" cut. Center Hole: 3/8" Hole Diameter: .375" Length: 19-3/8" Overall Length: 19.375" Replaces: 25036R, 25036 Thickness: .156 Type: Medium Lift Width: 2-1/4" This is an Aftermarket part. Thanks for looking!