Sunbelt B1KU1024 20-1/2-in. XHT Heavy Duty Mower Blade for 60-in. Decks is designed specifically for Kubota mowers with 60-inch decks, compatible with models such as RCK60-F36, RCK60P-21Z, RCK60P-28Z, RCK60P-331Z, ZD21, ZD25, ZD28, ZD321, ZD326, and ZD331. This blade measures 20-1/2 inches long by 2-1/2 inches wide and is .250 inches thick, featuring a 1-1/8 inch diameter center hole and a high lift design. Crafted from Sunbelt’s patented Marbain® heat-treated steel, the XHT (Xtreme Hardness & Toughness) blade exceptional hardness and resistance to bending and impact damage, ensuring a cutting edge that stays sharper longer. These blades are approximately 25% to 40% harder than standard lawnmower blades, providing tight tolerances that rival equipment blades. The Sunbelt B1KU1024 blade is equivalent to Kubota part numbers K5647-34340, K5647-34330, K5668-34350, and Oregon 92-049, making it a reliable and durable choice for heavy-duty mowing needs. Model Number: B1KU1024