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 BLADES FOR 52" SNAPPER OR SIMPLICITY ZERO TURN. PART NUMBER 1737252 1737252YP