Oregon # Length Center Hole Width Thickness 91-078 20-7/8" 7/8 2.5" 0.31" Mower Blade Made To Fit John Deere (3 For 60" Cut, 7 Iron Decks, 1400, 1500, 2520, 495, 4100, 4200, 4400, 4500, 4600, 4700, 595, 600l, M665, Z-trac (520, 667, 757, 797,720, 820,...