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Specifications:Blade Thickness - 0.187"Blade Length - 18-5/8"Center Hole Size - 7 pt. starOffSet - 1/4"Air Lift - 1-1/8"Product DescriptionThe Oregon 92-103 replacement lawn mower blade is made to the exact OEM specification for optimum performance. Our blades are individually straightened and hardened to provide a consistent, cleaner cut and increase blade longevity.Product Details Center hole: 7 point star Requires 3 blades for 54" cut Enhanced mulching for bagging and discharge efficiency Stays sharp and durable for longer Fits John Deere Models: 100 series and D170Fits the Following Models:John DeereD170, E180Replaces the Following Blades:John DeereGX21380, GY20679, GY20684, GY20686