Lawn Mower Blade Standard Length 20 1/2 in Width 2 1/2 in Thickness 0.305 in For Use With John Deere 400-455 Series Lawn and Garden Tractors F910-F935 and F1145 Series Front Mounts 670-955 Compact Utility Tractors with 60 in Decks Requires (3) for 60 in C