Specifications: Blade Width - 2.25" Thickness - 0.134" Blade Length - 21-3/4" Outer Hole Diameter - 3/8" Center Hole Size - 5/8" Center-to-Center - 1-7/8" OffSet - 1/2" Air Lift - 15/16" Product Description Oregon 100 Series Blades offers Ultra X-tended Cutting Length?, which means that each blade delivers its maximum mulching capability per rotation. Add that with our double bevel technology and the overall blade noise is reduced by up to 1.5 decibels. The 195-021 blade is made from Boron Steel that allows for the perfect balance between durability and ductility. Product Details Center hole: 5/8" For walk-behind mowers Reduces overall blade noise by up to 1.5 decibels Clean cut for manicured look Boron Steel Double Bevel blade provides the perfect balance between durability ductility X-Tended Cutting Length? optimizes the cutting efficiency with each revolution Replacement for major brand: Craftsman