Sunbelt B1PD5179 21 in. Predator Mower Blade for 60 in. Decks is designed for mower decks with a 60" cut and high capacity, including John Deere models X710, X730, X734, X738, X739, X750, X754, and X758. This blade is equivalent to John Deere part M163983 and measures 21 inches long by 2-1/2 inches wide by .250 inches thick, featuring a 29/32" diameter center hole. Each package includes one blade made in the USA. Sunbelt Predator blades an extended cutting length for increased efficiency and superior mulching capabilities d to traditional blades. The innovative airflow tooth design enhances blade strength while generating more airflow for finer clippings, and the cutting edges maintain their sharpness longer. Crafted from patented Marbain® heat-treated steel, these blades provide increased hardness and resistance to bending and impact damage, making them approximately 25% to 40% harder than standard lawnmower blades. This results in a cutting edge that stays sharper longer and ensures the tightest tolerances when d to equipment blades. Model Number: B1PD5179