Oregon 592-615 Pack of 2 Gator G5 Blades - 21-3/8" 2 Quality Gator 592-615 "Fusion G5" Mulching Blades For 42" Decks (7 Point Star Mounting Hole) Replaces John Deere Blades Part Numbers GX22151, GY20850, AM137333, AM137328, M156416 21-3/8" Long, 3.00" Wide, .203" Thick, Mounting hole is a 7 point star hole Fusion Blades have Tungsten Carbide "fused" to the edge (see photo) for longer life Extended cutting length, blade is sharpened longer up the blade