BFO1009 Features: * Blade replacement * Fits most AYP, MTD, murray, sears, snapper, and other mowers * Carded * 9 lbs * Made in USA Options: * Available in 18"", 19"", 20"", 21"" and 22"" sizes Specifications: * All blades have 1"" center hole with a cover washer and 6 reducing washers in 0.38"", 0.44"", 0.5"", 0.56"", 0.63"", and 0.81""