The Oregon 98-068 Lawn Mower Replacement Blade is manufactured to exact OEM specifications for optimum performance. Our blades are individually straightened and tempered to provide a consistent, clean cut and extended blade life. MORE DETAILS: Center Hole: Butterfly Uses for 20″ walk-behind mowers Enhanced tempering to keep the blade sharper and longer lasting High Lift: Aggressive blade angle increases airflow to push debris up and out for superior bagging or side discharge Replaces major brands: Bolens, MTD, Cub Cadet SPECIFICATIONS: Color Black Volume 45.655 in3 Product Unit Each Weight (with packaging) 1.57 lbs Product Height 0.134 Product Length 20″ Product Width 2.25 Blade Width 2.25″ Blade Thickness 0.134″ Blade Length 20″ Outer Hole Diameter 5/16″ Center Hole Size Butterfly Spacing Between Centers 2-1/2″ Offset 5/16″ Air Lift 13/16″