Standard Blade / John Deere M143504Pack Size:1John Deere M143504Oregon 90-309John Deere 2320 and 2520 compact tractors; X465, X475, X485, X495, X575, X585, X595, X700, X720, X724, X728, X729, X740, X744, X748 and X749 lawn tractors; requires 3 for 62" deckLength: 21 5/8 ", Center Hole: 13/16 ", Width: 2 1/2 ", Thickness: .250 ", Heavy-duty