Prime Line 7-044073 Lawnmower Blade Replacement for Model John Deere GX22151 and GY20850, 21-3/8-Inch Length Length: 21 3/8" Center Hole: Star Width: 2 3/4" Thickness: .160" Fits Models 102, 105, 115, 125, 135, 160 Tractors; Fits LA100 & Z225 Series with 42" Deck