Sunbelt B1SC3802 21-in. XHT Lawn Mower Blade for 61-in. Decks is a heavy-duty mower blade designed for commercial mowers such as Ferris, Scag, Wright, Exmark, and Toro with 61-inch mower decks. This 21-inch long blade features a medium lift notched design, measuring 2-1/2 inches wide and .197 inches thick, with a 5/8-inch diameter center hole. Crafted from Sunbelt's patented Marbain® heat-treated steel, the XHT (Xtreme Hardness & Toughness) blade exceptional durability with increased hardness and resistance to bending and impact damage. This innovative treatment ensures the cutting edge stays sharper longer, making XHT blades approximately 25% to 40% harder than standard lawnmower blades. The blade maintains tight tolerances comparable to equipment blades, providing reliable performance and longevity. It is sold individually and is equivalent to a wide range of part numbers for easy . Model Number: B1SC3802