SPECIFICATIONS Blade Width – 2.50″ Thickness – .250″ Blade Length – 20-1/2″ Center Hole Size – 5/8″ Offset – 3/4″ Air Lift – 1-1/16″ PRODUCT FEATURES Oregon 91-239 Lawn Mower Replacement Blade is manufactured to exact OEM specifications for optimum performance. Our blades are individually straightened and hardened to ensure a consistent, clean cut and increase blade longevity. PRODUCT DETAILS Center Hole: 5/8″ Requires 3 blades to cut 60″ High Lift: Aggressive blade angle increases airflow to push debris up and out for superior bagging or side discharge. Superior mulching for efficient bagging and discharge Reinforced hardening to keep the blade sharper and longer lasting Replacement for leading brand: Gravely