Oregon Chai Set of 3, Longer Life 592-616 Gator Fusion G5 3-in-1 Mulching Blades to Replace John Deere GY20852, GX21784, GX21785. Made in USA 3 quality gator 592-616 "fusion G5" mulching blades for 48" decks (7 point star mounting hole) Replaces john Deere blades part numbers gy20852, gx21784 or gx21785 Fusion blades have tungsten carbide "fused" to the edge (see photo) for longer life Extended cutting length, blade is sharpened longer up the blade