XHT blades are made from the highest grade of steel for the best cutting and performance money can buy. With the best hardness, strength, and durability in the market, this range of blades is recommended for every mower in the market. They are stronger, harder, and last longer in any environment. 3/4" Center hole, 18-9/64" long from cutting tip to cutting tip, .197" thick, 2" wide, Outer hole 13/32", center to center from outer hole to outer hole is 2-9/16" XHT 3 Replacement HD Blades for Simplicity 1708229 1726453A 1708229AS 1726453BZ